Edmonton police have officially ruled the deaths of a man and a woman last spring was a case of murder-suicide.

The investigation began after police were called to a home in Riverbend on May 31, 2012 at about 4 p.m.

Officers arrived to find a 20-year-old female suffering from carbon monoxide poisoning, and two family members in another room of the home were unconscious.

Police said they found a barbeque in the bedroom where the unconscious man and woman were found, it contained charred briquettes.

The two family members were rushed to hospital, where they both died – the young woman was treated for carbon monoxide poisoning and released days later.

Investigators said at the time the circumstances surrounding the deaths indicated they were not accidental.

After a nine-month investigation, homicide detectives said the Medical Examiner had determined a 50-year-old man had died as a result of carbon monoxide poisoning and drugs in his system.

The 46-year-old woman’s death was determined to be non-criminal in nature.

Police said they are not seeking any other persons of interest in the case, and no further charges are pending.