Authorities say a man fatally shot his partner and their two children before setting their New Jersey shore house on fire and killing himself.

Monmouth County's acting prosecutor said Thursday investigators have determined 35-year-old Lyndon Beharry killed 29-year-old Amanda Morris and their two sons, 7-year-old Brandon Beharry and 4-year-old Brian Beharry, before shooting himself in their Long Branch home on Sept. 1.

Autopsies determined Amanda Morris and Brandon Beharry were killed by smoke inhalation and thermal injuries with gunshot wounds being a contributing factor. Brian Beharry's cause of death was determined to be gunshot wounds to the torso with smoke inhalation and thermal injuries contributing to his cause of death.

Lyndon Beharry was a 16-year employee of the Long Branch Public Works Department.