Riley was shot around 1 p.m. Officers found him lying in the street. He was taken to a local hospital but died around 5 p.m.
Witnesses told police that Riley was fighting with a black man with shoulder-length braids in his mid-20s when the man shot Riley and fled on foot. Police say there are no suspects in custody.
If you have information that can help them solve Riley's killing, call the TIPS Hotline at 816-474-8477.
KCMO's homicide total is now at 80 for 2012. The Kansas City Police Department has cleared 33 of those homicides (41 percent). See the latest homicide analysis after the jump.