Suspected gang member Willie Clark was found guilty of murder on Thursday in the 2007 shooting death of Denver Broncos cornerback Darrent Williams.
The verdict was the culmination of an 11-day trial, and came after the jury deliberated for a day and a half.
Clark, who faces life in prison when he is sentenced on April 30, showed no emotion as the verdict was read. He was taken from the court in handcuffs.
Williams' mother, Rosalind, wept as she departed the courtroom.
Williams was killed on New Year's Day 2007. Prosecutors said Clark fired the fatal shots from a sports utility vehicle that pulled up beside a hired limousine carrying Williams and some friends.
"It was this man, who indiscriminately, with universal maliciousness ... took it upon himself to unload his .40-caliber handgun into that limousine full of innocent people," Chief Deputy District Attorney Timothy Twining said in his closing argument.
Williams died almost instantly when a bullet pierced his neck.
The killing came hours after the popular cornerback played in a 26-23 overtime loss to San Francisco that ended the Broncos' NFL season.
Two others with him in the limousine leaving a Denver nightclub were also injured.
Prosecutors maintain that Williams' group got into a dispute with a group that included Clark, sparking the shooting.