An investigation has determined Lethbridge police officers were justified in fatally shooting a Bhutanese man in July, 2012.

Emergency calls that day indicate Deu Raj Puri, 26,  was threatening people in a home with a knife.

He refused to drop the knife when police arrived and both officers fired their guns.

Friends say Puri -- who had recently immigrated to Canada -- was mentally ill and drunk at the time.

The Alberta Serious Incident Response Team says Puri posed a credible threat and the officers had no choice.

ASIRT is an independent agency that probes all incidents involving police that result in death or serious injury.