Raffaele Sollecito, Amanda Knox's former boyfriend, insists he's innocent of murder but admits he was impaired the night that their lives changed forever.
In his new book, Raffaele is open about the fact that he and Amanda used marijuana, and more significantly, acted in a way that invited police suspicion.
Amanda Knox's conviction was overturned last year, along with Sollecito's, and both were released from prison - four years after her roommate's death.
Authorities said Meredith Kercher, 21, was killed in Knox's Perugia, Italy, apartment in a sex game gone awry. The sensational case dominated news.
In the book Honor Bound, Sollecito, who is Italian, acknowledges their "odd" behavior when Kercher's body was found, reports the Associated Press.
As police investigated, Knox and Sollecito reportedly kissed and caressed outside and later at the police station, Knox sat in his lap, arms draped on him.
Sollecito notes in the book they had no "real alibi the night of November 1 except each other" and that during his first night in prison he became conflicted.
He wavered between "great waves of indignation and a nagging sense of guilt," he writes, although he insists he was innocent of Kercher's murder.
Raffaele Sollecito was mad at himself for having a bad memory from the marijuana he and Knox smoked, he says. Knox is writing her own memoir.
[Photos: Pacific Coast News]