Veronica Robertson identified her son as Liquorian Robertson -- a father of five.
He was killed at about 1:20 a.m. at the Diamond Inn in the 8900 block of the Gulf Freeway near Canniff Street.
Authorities have video of the suspect, who they say was wearing a clown mask and a dark blue hoodie.
According to officials, the suspect walked directly to Liquorian, who was sitting inside his vehicle, and fired more than 10 rounds at him. The suspect immediately ran off, heading northbound on the Gulf Freeway service road.
The suspect was behind Liquorian when he started shooting. Liquorian died at the scene.
"Whoever took my son life, I want them to know God is real and justice will be served through God or the justice system. May God deliver them for being unrighteous toward my child and may God bless them all," Veronica Robertson said.
Veronica told ABC13 her youngest son was killed 13 years ago.
It's unclear what led up to this shooting, but police are asking anyone with information to call HPD or Crime Stoppers.