NYPD Chief of Detectives Joseph Kenny said Rivera "was asked to leave the car, he was given a lawful order numerous times to step out of the vehicle, he refused."
Previously, videos circulated on social media showing the suspects' arrest, with one seen trembling on his knees and confessing to orchestrating the attack.
Russian President Vladimir Putin said on Saturday that the four attackers responsible for the "barbaric terrorist act" had been "captured and detained."
Kensington Palace has said that it will not disclose the specific type or stage of cancer the princess has and has urged people not to engage in speculation.
The Delta Chi fraternity member was in Tennessee for their annual spring formal trip when he was thrown out of the bar shortly after 9:30 p.m. on March 8.