A man fatally shot an acquaintance in front of her Queens home yesterday before turning the gun on himself, cops said.

David Chea, 55, allegedly got into a heated dispute with Lori Eng, 51, when he whipped out a gun and began firing.

He struck her twice in the chest on 56th Road, in Flushing at 5:10 p.m., cops said. Chea, of Manhattan, then shot himself once in the head and collapsed in the driveway of the home, opposite Kissena Park, police said.

A witness said there was a gun near the Chea’s body. Cops said a .38-caliber gun was recovered at the scene.