Four family members were killed in a violent stabbing spree at a Queens, New York residence early Sunday morning, police officials said, and the relative behind the attack went after two police officers before one shot him dead in the driveway.

As police probe what caused 38-year-old Courtney Gordon to allegedly stab several of his family members to death in Queens, relatives on his mother's side say signs of his mental health issues were building for months.

Authorities have identified the four family members killed in a violent stabbing spree at a Queens home over the weekend that also left two police officers injured. Two of the victims in the Far Rockaway rampage were children.