BARRIE -- A Toronto man now serving time in prison for taking part in the murder of Katlin Cousineau testified he is labelled as a "wheelchair killer" and is afraid he will be slain in prison.

"I could be dead by the end of the day," said Mat Sitte, 27, as he stood in the witness stand before a jury.

On trial for first-degree murder, is Paul Bradey, 45, of Midland. The Crown alleges Bradey tortured Cousineau with a blowtorch while Sitte helped on Nov. 12, 2005.

Sitte told the jury of life inside Kingston Penitentiary, where he was sentenced to life in 2007 after pleading guilty to the second-degree murder of Cousineau.

While in prison, Sitte said he has been muscled and kicked around and beaten, and warned that he'll be stabbed with an infected needle in the "meds" line, because other inmates don't approve of his crime, or the fact that he is testifying against, or "ratting out," another man.

"I'm going to have to watch my back," said Sitte. "These are really serious people in this jail. Like really dangerous."

He said he was afraid for his life and got moved from the general population to the mental health unit, where he has less freedom and is locked in his cell 23 hours a day.

"I don't like violence. I'm a peaceful person. I'm trying to make peace with God."

Sitte, who is diagnosed with borderline personality disorder, depression and anxiety, is at a Grade 5 level and is taking grammar courses while in prison.

He also told the jury how he grew up in Toronto after his drug-addicted mother abandoned him at the age of two.

Sitte moved into the Midland home with Bradey and his girlfriend Susanna Balogh, along with Balogh's friend, Cousineau.