ROCKLAND — A 35-year-old Rockland man is on trial in the strangulation death of his ex-girlfriend.

Opening statements got under way this afternoon in the trial of Arnold Diana, who is charged with strangling 47-year-old Katrina Windred of Friendship in his apartment on Nov. 20, 2010, while her 11-year-old son sat outside in her car reading comic books. Her body was dumped on the outskirts of town, where it was found three days later by a man walking his dog.

A judge in March threw out the confession that Diana made to police, but prosecutors said the ruling wouldn’t have a significant impact on the case.

Jury selection was completed Friday.