The first happened around 12:30 p.m. in the 5800 block of Golden Forest Drive near Antoine Drive.
A black Cadillac Escalade drove up to the victim and someone inside fired at least 17 shots toward the victim, killing them and left a white Corvette with multiple bullet holes, according to police. The victim was believed to be driving the Corvette before he was shot.
The victim, identified by family members as Deondre Perkins, 27, died at the scene.
Detectives said the Cadillac sped away from the location, which is a neighborhood with multiple homes and apartments. Multiple people may have seen what happened, investigators said.
Surveillance cameras in the area recorded the suspects fleeing the scene, but police were still looking for the shooter.
Less than two miles away, investigators were looking into another gun-related incident where a man was shot in the head outside an apartment.
It happened around 2 p.m. in the 6400 block of Antoine Drive. It didn't appear that the two incidents were related.
The victim in that shooting died, according to Houston police. A witness said a newer white pickup truck was seen leaving the scene, according to police.