A former RCMP constable accused of killing his wife with his service revolver wants a judge to find him not criminally responsible.

Tirth Sehmbi is charged with second-degree murder in the July 10, 2010, shooting of Rajpinder Sehmbi in their southeast Edmonton home.

During closing arguments Thursday, the court was told Sehmbi became convinced that his 29-year-old wife was having an affair.

He hired a private investigator and installed surveillance cameras throughout the house.

According to the agreed statement of facts, Sehmbi shot Rajpinder 16 times — three times in the head at close range.

"He emptied his service revolver into her," Crown prosecutor Carrie Sharpe said. "There was blood everywhere."

Sehmbi later said he saw two men in the room who made him raise his arm to shoot.

Three of five doctors who testified at the hearing believe Sehmbi was not criminally responsible at the time of the shooting because he was suffering from delusions.

The judge will rule on Friday afternoon whether Sehmbi should be found not criminally responsible in his wife's death.

Sehmbi has been diagnosed with paranoid schizophrenia.

His mental condition has declined since he was charged three years ago. He now has a low IQ and only speaks when spoken to.

With files from the CBC's Janice Johnston