PORTLAND — Jury selection is getting under way in Maine in the murder trial of a Massachusetts man charged with fatally shooting the mother of his four children and his longtime friend.

Thirty-year-old Joel Hayden of New Bedford is charged in the deaths of 27-year-old Renee Sandora of New Gloucester, Maine, and 28-year-old Trevor Mills, also of New Bedford.

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Police say Hayden shot the pair outside Sandora’s home on July 26, 2011, with Sandora and Hayden’s 7-year-old son witnessing the shootings.

An affidavit says Sandora’s parents told investigators that Sandora had recently kicked Hayden out of their home, and that he had accused her of having a relationship with Mills.

Jury selection begins Friday in Cumberland County Superior Court. Testimony is expected to start Monday.