12/1/2016 2:24 PM PST BY TMZ STAFF
Breaking News
UPDATE: Cops say they have detained a man they believe to be the shooter — 54-year-old Ronald Gasser.
Cops say McKnight did NOT have a gun at the time of the shooting.
Emergency responders tried to administer CPR but to no avail. 
Ex-NFL running back Joe McKnight was murdered in a road rage shooting in New Orleans … law enforcement tells TMZ Sports.
The incident occurred at 2:43 PM. Family members identified the 28-year-old at the scene.
A witness told NOLA.com … she saw McKnight trying to apologize to another man after some sort of traffic incident.
The witness says the man then pulled out a gun and shot McKnight — and while standing over him screamed, “I told you not to f*** with me” … then fired another shot into his body.
McKnight was a high school phenom — considered the best running back in the country.
He played college ball at USC. He was drafted by the NY Jets in 2010.
Story developing …
