Under tough cross-examination from the Crown, forensic psychiatrist Dr. Philip Klassen maintained that Richard Kachkar was "probably psychotic...and that psychosis had directed his actions" the morning Sgt. Ryan Russell was killed.

The defence is arguing that Kachkar was suffering from a mental disorder and should be found not criminally responsible for the death of the 35 year-old father.

Under cross-examination the clearest picture yet of the Crown's theory of Kachkar's state of mind emerged.

Crown Attorney Christine McGoey suggested to Klassen that a frustrated Kachkar took out his anger in a violent, possibly suicidal rage.

Klassen told court that although "it's possible" he couldn't find any evidence to back that up.

"You may well be right," he told McGoey saying that those that spoke to Kachkar before Russell's death did speak about possible feelings of resentment or bitterness. "That's (a violent suicidal rampage) the picture that gets painted from this...contact in the days preceding."

Klassen is sceptical about Kachkar's claims that he doesn't remember much or anything about the morning that the officer was killed, but says his behaviour reported by others in late December of 2010 and early January 2011 appear consistent with a psychotic episode.

There are about two more weeks of evidence expected in the trial with the second psychiatrist in the defence's case likely to take the stand late next week.