PORTLAND – Jurors went home without a verdict Tuesday in the manslaughter trial of a Massachusetts boater accused of causing a fatal collision on a Maine lake.

Prosecutors argued that Robert LaPointe, 39, of Medway, Mass., was recklessly zooming across Long Lake at night when his 32-foot speedboat collided with a smaller boat. The defense contended that LaPointe didn’t see the 14-foot boat in front of him because it was black and had its lights off.

Killed in the collision on Aug. 11, 2007, were Terry Raye Trott, 55, of Harrison, and Suzanne Groetzinger, 44, of Berwick. LaPointe and his passenger survived being thrown from their boat.