The Calgary police officer who shot and killed a 40-year-old man Friday night had used a stun gun on the victim during a confrontation in 2010, according to Calgary police Chief Rick Hanson.

During a news conference on Sunday, Hanson told reporters police had been called to the home in the 200 block of Erin Meadows Close S.E. in May 2010 to a domestic dispute.

Hanson said the victim and an officer were involved in a struggle that required the officer to use his Taser — a gun intended to incapacitate people with an electric shock.

That officer is the same police officer who shot and killed the same victim during an altercation on Friday.

The victim's family has identified him as Corey Peeace, 40.

Calgary police were called to the home at about 8 p.m. MT Friday evening by a woman who told a 911 operator she was in distress.

Police say the operator who handled the call overheard a man saying, "You are going to die today" in the background.

Police say when they arrived on scene they were confronted by a man with a knife. One of the officers fired several shots, hitting the victim four times.

The victim was pronounced dead at the scene.

Hansen defended the officer, saying it's not unusual for them to attend the same house multiple times.

"They have a micro-second to make a decision and they better make the right decision or someone's going to die."

The family alleges Peeace had launched a lawsuit against the Calgary Police Service following the Taser incident in 2010.

However, Hanson told reporters Sunday there is no evidence or record of a lawsuit.

He stressed that there appeared to be a "volatile and dangerous" situation inside the home when officers responded on Friday.

The name of the officer involved has not been released, but Hanson said the officer has three years' experience on the force. The officer said he was confident in the decision he made, Hanson said.

The Alberta Serious Incident Response Team (ASIRT), which looks into all police-related injuries or deaths in Alberta, is investigating.