<P> Light also manipulates a doctor accused of sexual assault charges to medically induce him into a coma before making the man kill himself . Meanwhile, the Death Note is used by different individuals manipulated by Light to continue the "Kira" killings before being left at his bedside . With Kira continuing to kill while Light is hospitalised, L is taken off the case by his superiors; however, James later deduces that his son is Kira and presents him with evidence supporting his claims, after he wakes from his coma . Meanwhile, L realizes Mia's involvement from a comment Light made during their standoff, racing to her home to search her possessions . He finds the Death Note page with the names of the FBI agents and contemplates writing on it in a hysterical fit . Back in the hospital, Light tries to convince his father that his actions were "the lesser of two evils", prompting Ryuk to laugh . </P> <Ul> <Li> Nat Wolff as Light Turner / Kira: A bright yet isolated high - school student who discovers the titular "Death Note" and uses it to kill criminals by writing their names and causes of death, in a bid to change the world into a utopia without crime, and thus, alongside Mia Sutton, becoming the world - famous serial killer known as "Kira", while being both praised and feared by law enforcement agencies and the worldwide media and public . </Li> <Li> Lakeith Stanfield as L: A nameless, highly - intelligent and well - esteemed--but also arrogant and slightly unhinged--international consulting detective with a past shrouded in mystery and who is determined to capture "Kira" and end his reign of terror . </Li> <Li> Margaret Qualley as Mia Sutton / Kira: Light's classmate and love interest, who becomes an ally in his mission to rid the world of criminals, jointly becoming the world - famous serial killer known as "Kira" alongside Light, eventually seeking to kill those who seek to stop them and becoming dangerously obsessed with the book's power . In an interview with io9, Adam Wingard revealed that rather than being based on original manga character Misa Amane, Sutton as a character is based on the sociopathic qualities of Light Yagami . </Li> <Li> Shea Whigham as Detective James Turner: Light's father and a veteran Seattle detective, who assists L in finding the mysterious "Kira", unaware that he is his own son . </Li> <Li> Paul Nakauchi as Watari: L's assistant and foster - father . </Li> <Li> Jason Liles and Willem Dafoe as Ryuk: A demonic god of death and the original owner of the Death Note, who begins communicating with Light when he receives the book and inquistively observes his activities as "Kira". Liles played the character in costume, while Dafoe provided voice work and performance capture for the facial elements . </Li> </Ul> <Li> Nat Wolff as Light Turner / Kira: A bright yet isolated high - school student who discovers the titular "Death Note" and uses it to kill criminals by writing their names and causes of death, in a bid to change the world into a utopia without crime, and thus, alongside Mia Sutton, becoming the world - famous serial killer known as "Kira", while being both praised and feared by law enforcement agencies and the worldwide media and public . </Li> <Li> Lakeith Stanfield as L: A nameless, highly - intelligent and well - esteemed--but also arrogant and slightly unhinged--international consulting detective with a past shrouded in mystery and who is determined to capture "Kira" and end his reign of terror . </Li>

Who played light in the death note movie