A New Jersey man yesterday morning chased down and shot his wife and their two sons — killing the 7-year-old — before being fatally wounded by an off-duty cop, authorities said.

Edelmiro Gonzales, 54, died at the same hospital where his son Edryn, 11, and wife, Johanna, 31, last night were listed in critical condition.

Edryn’s kid brother, Adrian, was pronounced dead at the grim scene in Paterson at 9 a.m.