He faces up to 20 years in prison for a December 2012 wreck after a night of partying with fellow Cowboys players. He could also get probation.
Jurors in Dallas took about nine hours over two days to convict Brent, who was led from the courtroom in handcuffs as family members sitting in the front row of the gallery sobbed.
Attorneys from both sides remain under a gag order that prevented them from commenting after the proceedings.
Prosecutors say Brent, a defensive tackle, was drunk when he crashed his Mercedes on a suburban Dallas highway in December 2012, killing Brown, a linebacker on the Cowboys practice squad who had also been Brent's teammate at the University of Illinois.
NFL great Deion Sanders took quarterback Andrew Luck and Cam Newton with his first skill-position picks in the Pro Bowl draft Wednesday, moving for passers early before focusing on defense in building a team for one win.
Jerry Rice took New Orleans tight end Jimmy Graham then Philadelphia running back LeSean McCoy with his first two picks, giving active player captain Drew Brees his top target early to go along with two Saints offensive linemen picked Tuesday.
Seattle Seahawks wide receiver Percy Harvin has cleared league-mandated concussion protocol and has returned to practice as a full participant. He suffered a concussion in Seattle's divisional playoff victory over New Orleans and sat out the NFC championship game Sunday because he hadn't been cleared to play.
The Atlanta Falcons hired Scott Pioli as assistant general manager.
Former NFL and University of Texas quarterback Vince Young has filed for Chapter 11 bankruptcy protection. The petition was filed last week in federal Bankruptcy Court in Houston, listing Young with estimated assets between $500,001 and $1 million and liabilities between $1,001,000 and $10 million.abilities between $1,001,000 and $10 million.