The defence admits Matthew Raymond shot the victims but is trying to prove that he should be found not criminally responsible because of a mental disorder.

Matthew Raymond is testifying in his own defence for a third day at his trial on four counts of first-degree murder.

The defence is trying to prove Matthew Raymond should be found not criminally responsible because of mental illness.

Defence lawyer Alex Pate returned to the witness stand Thursday to discuss video and audio recordings of court appearances and interviews with suspect Matthew Raymond.

On Tuesday, jurors viewed numerous videos of Raymond feedings and talking to animals such as squirrels and ducks, as well as videos of the accused biking on rails in Fredericton.

Matthew Raymond is accused in the August 2018 shooting deaths of Donnie Robichaud, Bobbie Lee Wright and police constables Robb Costello and Sara Burns.

Three officers testified Thursday morning at the trial of Matthew Raymond, who is charged with four counts first-degree murder.

The defence has acknowledged Matthew Raymond killed the victims but says he should be found not criminally responsible because of a mental disorder.

Const. Brett Arbeau was testifying Monday at Raymond's trial on four counts of first-degree murder.

Norma Foster told the court she awoke to the sound of gunshots shortly after 7 a.m. and called police.