Childhood[]
Baby William as his father commits a murder-suicide
William Murderface was raised by his grandparents Stella and Thunderbolt Murderface, after he lost his mother and father in a chainsaw murder-suicide, carried out in front of him by his deranged and mentally unstable father when William was just an infant. Although the baby Murderface didn't seem fazed by this as he was too immersed in eating and playing with his cereal; this memory is still traumatizing to him as an adult. While in high school, Murderface's principal allowed him to play bass, drink, and smoke dope to earn his high school diploma after Murderface threatened to cut his eyes out if he didn't let him graduate.
He wears Confederate flag underwear in Dethcamp, suggesting he may be from the South.
According to the comics, Murderface used to be bullied in highschool and rejected by everyone until he lit a full school bus on fire.
Prior to Dethklok[]
Little is known about his music career before Dethklok, though it is established in Snakes n' Barrels that everyone except Toki had been in a previous band.
Season 1[]
Murderface's feelings are hurt when his bandmates tell him they did not get him anything for his birthday, however, this is later revealed to be a prank. They give him the assassination car of President John F. Kennedy (including the assassination chair of President Abraham Lincoln) which makes him so happy he cries a blood tear. He promptly demolishes the gift and relishes at the opportunity to "destroy United States history."
Murderface seeks religious inspiration after miraculously surviving a severe fall from the dethcycle. His change in behavior causes Dethklok to consider firing him from the band, and Skwisgaar even suggests killing him. After sampling the customs of numerous religions including The Church of Satan, he comes to the conclusion that all religions are the same -- "all just a bunch of boring crap." He returns to his hedonistic ways with the band.
Season 2[]
Murderface continues to master the art of "bein' a dick," demonstrating these skills to Nathan and Pickles by sparking a fight between Skwisgaar and Toki, leading to a falling out between the two. He later apologizes to them.
After much criticism from his bandmates regarding his lack of talent, Murderface attempts to write a song on acoustic guitar, which he never finishes because he smashes the instrument.
Murderface attempts to produce a "Nascar-type theatrical hybrid event" but struggles to handle the pressure and responsibility. On the night of the event he becomes incapacitated by a cocktail of drugs given to him by Pickles.
When Nathan is first attacked by Lavona Succuboso, Murderface blocks the attack by diving in front of Nathan with his bass, legitimately protecting him.
Murderface and Toki write and record a grunge rock song called Takin' It Easy, an accomplishment they are both very proud of until the song fails to impress their bandmates and the two are unable to agree on who deserves the most credit for the track.
Murderface does a good deed when he ushers attendees of a record release party to safety during an attack on Mordhaus.
Season 3[]
Murderface experiences sexual confusion after he becomes aroused during a health exam by a male doctor. He later concludes that the doctor intentionally aroused him.
With the help of Dick Knubbler, Murderface attempts to produce a TV Christmas special featuring Dethklok. The special is ultimately a disaster when the set is crashed by Dethklok's mothers and Doctor Rockzo. He is also punched in the face by Nathan, who is enraged to learn the event is being sponsored by the Church of Christian Churchology.
Murderface dresses up for his Christmas special
When Skwisgaar struggles to come to terms with his fatherless childhood, Murderface attempts to become closer to Skwisgaar in hopes it will give him a shot at Skwisgaar's mother, Serveta. He succeeds only in annoying Skwisgaar and infuriating Pickles, who becomes jealous of all the attention given to Skwisgaar. Murderface triggers Pickles's memory of being rejected by his own father, leading Pickles to beat Murderface up, along with Toki, who joins in the beating just for the fun.
Murderface challenges Skwisgaar's sexual prowess, betting he can sleep with as many women as Skwisgaar. The bet only results in several sexual harassment reports filed against Murderface and a steady stream of groupies into Skwisgaar's lap.
Murderface attempts to sue his bandmates for residual credits to Dethklok's albums, along with Toki, who ruins their claim in court by honestly admitting that they do not deserve the credit. Pickles, Nathan and Skwisgaar become annoyed with Murderface's constant attempts to take credit where it isn't due and drag Toki into his schemes, and they send him walking home to Mordhaus alone. He takes the opportunity to sing a heartfelt song about how nothing that requires any effort is worth doing. This leads to yet another scheme, and Murderface convinces Toki to start a record label with him. For once he actually tries to work hard, however, he comes to regret this when the talentless band he recruits mistreats him and takes credit for his work.
Season 4[]
Murderface briefly sports a thick mustache, leading to ridicule and exclusion from his bandmates.
Murderface revisits his old hobby of pranking Toki and Skwisgaar, leading to much confusion and embarrassment for the two Scandinavians. They get revenge on him by framing him as a terrorist, although they also incriminate themselves in the process.
When Toki visits a summer camp, Murderface takes the opportunity to hang out with Skwisgaar. The two enjoy a horror movie marathon and binge on sweets, activities they avoid when Toki is around due to his sensitive nature and diabetes. They later have a sleepover in Pickles's room after the horror movies give them the creeps.
Murderface wins the Brutalies Award for Most Brutal Looking Musician. His bandmates are quick to point out that he should take this not as an honor but as a public insult. Murderface quickly sinks into a deep depression and guilts Nathan into loaning him a large sum of money for plastic surgery. Though he insists Nathan keep his plans a secret, he reveals the secret when the band is shocked to see unflattering paparazzi photos of themselves on a celebrity gossip TV program. This sparks Nathan and the other three members to question their looks as well. Murderface tries to remain discrete and save money on his procedures by having the operations performed at an unlicensed under-the-table clinic in Tijuana, Mexico. When he shows up at the awards ceremony he sees his bandmates have also altered their appearances. He reveals his new face hoping to shock his friends and the audience with his 'Handsomeface', but to his dismay his face has become swollen and infected. Everyone flees in horror and Murderface screams as Skwisgaar throws hot coffee in his face.
In yet another bid for credit and attention, Murderface announces he is going to starve himself to death. This only results in him drinking heavily on an empty stomach and being punched in the face by Pickles.
When Dethklok temporarily disbands, Murderface takes an interest in politics and employs Toki as an intern. His political aspirations are ruined when Toki leaks Murderface's masturbation selfies onto the internet.
The Doomstar Requiem[]
When the search for Toki leads Dethklok to a bar called The Depths of Humanity, a member of The Revengencers intentionally scratches Murderface's arm with the poisoned spikes on his bracelet, while distracting him with compliments. Murderface's eyes go into a trance, but Nathan grabs him and they exit the bar. Later Murderface urges Dethklok to give up their quest, saying "We should make a run for it now, because if that was me inside, none of you would come to save me anyhow." Nathan assures him he would risk his life to save him as well, and they rescue Toki.
As Murderface sleeps, the mysterious poison is shown spreading through his veins, and his eyes glow.
Army of the Doomstar[]
He causes quite the ruckus during the memorial services for Ishnifus Meaddle, and acts considerably childish, playing on his Dethphone during the ceremony with the sound cranked up. He yells frequently in the church, and farts loudly, which echoes throughout the building. This immature behavior is similar to Toki's state of regression, though Toki's presents in a much more reserved and timid way.
Forced to deal with the effects of a mysterious, magical poison in his veins, Murderface becomes increasingly reclusive throughout the film. Before leaving to travel to Deus Keep, he gets ready in his bathroom and the poison begins to worsen. Staring at himself in the mirror, he feels the presence of a familiar yet foreboding figure lurking around him. This figure haunts him, and his arm begins to contort painfully, causing welts and tears in his skin as his veins bulge outward and for a moment he sees himself, with blood dripping down his skull, in the mirror. This results in him isolating himself further, and he puts on a long-sleeved black shirt underneath his regular outfit to hide the visible scarring and veins on his right arm.
When asked what his role in the band is, he's unsure. He accepts that he "does nothing" for the band, which the other band members agree with. They all proceed to berate him, saying he doesn't do anything, and that he's there for one purpose- to suck. In terms of familial roles, he's given the role of brother.
He is visited by Salacia once more, late at night as he plays on his phone, where he's told he belongs to Salacia. The half-man's shadow engulfs him and his eyes turn a glowing yellow, signifying his possession. He is then used as a tool and a spy for Salacia to ruin the band's chances at creating the Song of Salvation, and convinces as well as manipulates Nathan to use electronics. He warns him to not look online and read all the bad things people are writing about him, which Nathan ends up doing, leaving him bitter and angry. Murderface then rushes to tell Knubbler that Nathan is cheating and using a laptop (which Murderface had snuck into Deus Keep, as well as his phone), when it isn't allowed.
Being used further as a tool for the enemy, Murderface roams the hallways at night in order to find and locate the Army of the Doomstar. This, in turn, helps Salacia send his military forces to Deus Keep in order to bombard them while they perform Aortic Desecration. After this performance goes wrong, Murderface runs away and isn't anywhere to be found. Skwisgaar, who had seen Murderface roaming around at night, reveals to Dethklok that Murderface is the spy. They then all chase after him after General Crozier gives a detailed explanation on how Salacia's possession works, and what they need to do in order to save their friend.
William is held under the water by the other four in order to expel Salacia from his body. He goes limp during the exorcism, and the demonic being is soon forced out of him as he rises from the ground with bright yellow lights shooting from his mouth and eyes. Once he regains consciousness, he faces terrible guilt for what he's done, and even compares himself to Magnus. The band reassures him that none of what happened was his fault, and that he does indeed have a use in the band. His idea that "you can't hear the bass" is rebutted by the statement "but you can always feel it", and he's encouraged to be the voice of dissent. The band then embraces one another in a group hug.
While Dethklok is trapped by Salacia, Murderface expresses disappointment that he'll be dying without ever having finished Planet Piss. Later on, once the band has escaped Salacia's clutches and is in the midst of a grand final battle, he throws a snowball at Orlaag's head to distract him and save Charles. Same as the others, Murderface is seen acquiring the Dethlights in order to defeat Salacia.