FOX CREEK, Alta. -- Alberta government investigators have cleared three Mounties who shot a murder suspect last summer.

RCMP responded to reports of a suspect killing a man and a woman with a large butcher knife in June 2015 at an oil industry work camp near Fox Creek.

Investigators say the Mounties fired a total of 13 shots at the man when he refused to drop the knife and lunged at the officers.

Susan Hughson, executive director of the Alberta Serious Incident Response Team, says after reviewing the investigation there is no evidence that suggests the officers committed any offence.

Daniel Goodridge, who is 30, is to stand trial on May 15, 2017, on charges of first-degree murder and second-degree murder.

Fox Creek is 260 kilometres northwest of Edmonton.

"The evidence very clearly establishes that there are no reasonable grounds, or indeed reasonable suspicion, to believe that any of the officers committed an offence," Hughson said Monday in a release.

"This was undoubtedly a harrowing and horrific incident but, practically speaking, the officers' attendance and engagement of the man ended the incident before any civilian workers still present were injured or killed."