reporter: philip chisim is excused from the afternoon session of his murder trial and choosing not to confer with his attorneys on the soon to come closing arguments. >> have i asked you mig at all that confused you? >> the teen's clarity of mind the day of the murder is at issue. a psychiatrist said he hears voices. dudley says he is remorseful. two years ago he stabbed, robbed and raped his 24-year-old danverse high school math teacher. >> not really understanding that the voices were an illness and not being able to manage it and being helpless in response to the voices and how that resulted in behaviors that were really not him. >> prosecutors asked how a mentally ill chisim could be so methodical about murder. was he insane or faking psychosis? the central theme along with past trauma in chisim's life. >> when questioned about the trauma, he said i won't talk about it. >> i won't talk about it? >> i can't talk about it. >> later he said he was told not to talk about what happened in the past. testimony resumes at 9:00 a.m. rhondella richardson, wcvb, newscenter 5. heather:the mas