The Hudson County Prosecutor's Office says 28-year-old Adepso Collado apparently shot his estranged wife, 26-year-old Kenia Collado, in her Bayonne home Monday.
Thirty-one-year-old Jose Guzman and Guzman's 14-month-old son also were killed.
The estranged wife's roommate was wounded and two other children in the home escaped unharmed.
Authorities say Adepso Collado then turned a semiautomatic handgun on himself. He was found dead downstairs and the victims were upstairs.
Neighbors described how gunshots punctuated the night on the block near the Bayonne Bridge.