<P> Light agrees to turn over the book at the Seattle Great Wheel, and then flees from police . L catches up to him and prepares to kill him, but is knocked out by a passerby who overhears that Light is Kira . Light meets Mia and takes her to the top of the Ferris wheel, trying to convince her that they will be happier without the Death Note . Seemingly persuaded at first, Mia tries to steal the Death Note, much to Light's intense dismay . Initially confused, she realises that Light has written her name in the book, her death being contingent on her taking the Death Note from him . The Ferris wheel collapses, causing Mia to fall to her death whilst Light and the Death Note land safely in the water; L watches as the page with Light's name drifts into a burning barrel . </P> <P> Having orchestrated Mia's death and his own survival, Light also manipulates criminals so he is medically induced into a coma, whilst the Death Note is used to continue the Kira killings before being left at his bedside . With Kira continuing to kill whilst Light is hospitalised, L is taken off the case; however, James later deduces that his son is Kira and confronts him after he wakes from his coma . Meanwhile, L realises 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 and remark, "You humans are so interesting ." </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 near - mythical, highly - intelligent and well - skilled--but also arrogant and slightly unhinged--FBI profiler 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 James Turner: Light's father and a veteran Seattle detective, who aids 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 Light's 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>

Who plays light's dad in death note