BANGOR — The lead detective in the investigation of the fatal shootings of three Maine residents found in a burning car says no further arrests are expected.

Sgt. Paul Kenison from the Bangor Police Department spoke as a man arrested in Massachusetts made his first court appearance in Maine. Flanked by two attorneys, Nicholas Sexton, 31, of Warwick, R.I., pleaded not guilty to murder and arson on Monday.

Sexton and Randall “Ricky” Daluz of Brockton, Mass., are charged in the grisly case. Daluz also has pleaded not guilty.

They’re accused of fatally shooting Daniel Borders of Hermon, Nicolle Lugdon of Eddington, and Lucas Tuscano of Bradford, then setting fire to a rental car with the bodies inside. The car was discovered burning in Bangor parking lot on Aug. 13.