The deputy has been a member of Alameda County Sheriff's Office for 20 years and hasn't returned to work since the night of the incident after reportedly suffering a concussion and serious jaw injury during the attack, which the deputy claims was "unprovoked".
The altercation occurred when Ujiri was trying to get on the court after the Raptors beat the Golden State Warriors in Game 6 to win the National Basketball Association championship.
Ahern's office will recommend Alameda County district attorneys pursue a criminal charge of misdemeanor battery on an officer. The team had no comment Tuesday.
The office does not plan to release the deputy's body camera footage to the public during the investigation, said Kelly, who confirmed the officer is on medical leave.
"The officer is off work, disabled and wants to go back to work", Mastagni said.
"I have heard there's been at least some communication between the franchises and Toronto has expressed that if they're going to give up Masai Ujiri, they would like to have, I've been told, significant compensation", said Brian Windhorst on the Hoop Collective podcast.
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A Warriors fan who witnessed the incident told The Associated Press that the sheriff's deputy didn't ask for any credentials before putting his hand on Ujiri's chest and pushing him.
Several bystanders intervened and Ujiri got onto the court without displaying any credentials, Kelly said.
He says the deputy could file a lawsuit. But on Tuesday, he said he remembered the officer shouting, "No one gets on the court without credentials".
"We were given explicit instructions that even if it was an executive or an owner that they too were not allowed on the court without the proper credentials", he said.
"We had the opportunity to make an arrest and we chose not to", Kelly said. There is a video circulating of what happened after the alleged altercation, but authorities are looking for footage of the physical part of the scene.
"This is a case about a credential or no credential not a case about race", said Mastagni.