The incident happened Tuesday around 4:45 a.m. in the 11000 block of Holly Hill Lane, near Brittmore.
The victim, whose name has not been released, was at his mom's house when he heard a "disturbance" outside. The man went outside to check on the disturbance. When he didn't return, his mom went outside, where she found him on the porch with gunshot wounds.
There's no description of the suspect.
Authorities are now asking neighbors in the area for surveillance video to help find the suspect.