Respond to Reading

I am reading a book called "The Rag and Bone Shop". So far it is about a boy named Jason who has a friend, named Alicia, that is murdered. He is questioned at home by a detective. The detective somehow thinks that Jason could've been the person who killed Alicia since he was the one who last saw her. This situation kind of reminds me of an episode of CSI that i saw. I dont quite remember what the story was about, but it had to do with the same situation: the last person who saw the victim alive became the suspect, which meant that that person really was the peron who murdered the victim. In "The Rag and Bone Shop", i don't think that Jason was the one who murdered Alicia because after he found out she was dead, he started to cry.