Twenty-four-year-old Cody Legebokoff admitted in B.C. Supreme Court last week that he was present when the three women died but that he didn't murder them and said the girl killed herself.
He refused to name his alleged accomplices, saying he didn't want to go to prison being labelled a "rat."
His lawyer, James Heller, told the jury there is reasonable doubt that the murders were planned and deliberate.
Heller told jurors that he didn't expect them to believe every word of Legebokoff's testimony but he hoped they would consider the plausibility of some of his statements.
Legebokoff is charged with four counts of first-degree murder in the deaths of Jill Stuchenko and Cynthia Maas, both 35, Natasha Montgomery, 23, and 15-year-old Loren Leslie (CKPG)