A convicted murderer in a jealous rage attacked his wife and her teen son in their Queens home — stabbing the two before fatally shooting himself during a police standoff, police sources said Thursday.

Sukele Lewis, 45, went after wife Edwidge Desgraves, 37, the moment she walked through the door of their Laurelton home on 227th Street at around 11:30 p.m. because he suspected she was cheating on him, the sources said. Her son Justin Marshall, 17, intervened, and Lewis stabbed him in the shoulder.

Lewis, who had a limited order of protection against him that allowed him to live in the home but not to menace the woman, then stabbed Desgraves five times in the face and back, sources said. The woman locked herself in a bathroom with the teen and her 4-year-old son.

Police removed the family — and Lewis, who served 15 years in jail for a 1987 murder, shot himself in the head around 3 a.m.