Bruce Main was one of three people charged with two counts of first-degree murder in the deaths of Mission, B.C. residents Lisa Dudley and Guthrie McKay.
Police say officers were first dispatched to the couple's Mission neighbourhood on Sept. 18, 2008 after getting a shots fired call, but they didn't find anything.
However, when they were called back on Sept. 22, 2008 they found the couple shot inside the residence. Dudley was pronounced dead at the scene and McKay died on the way to hospital.
The Integrated Homicide Investigation Team says Main pleaded guilty to two counts of manslaughter, Jack Woodruff is serving a life sentence for two counts of murder, and Justin Mackinnon remains in custody on murder charges.
Dudley's mother, Rosemarie Surakka, was given the green light by a court last month to sue the RCMP. She's alleging officers failed to properly investigate the shooting that led to her daughter's death.
"This was not a cut and dry investigation. It required many resources who were committed to long days in order to bring it where we are today," said Sgt. Jennifer Pound of IHIT in a statement.
"Two guilty pleas marks a success in the eyes of IHIT investigators and speaks to the abundant amount of evidence that was retrieved and sifted through in the past years."
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