SYRACUSE, N.Y. -- Two men have pleaded guilty for their role in the assault of a local radio host and his cousin Christmas night in downtown Syracuse, according to the defendants' attorney.

Hamzi Khan and Abdul Hamid Izat Haji pleaded guilty in Judge Anthony Aloi's courtroom to misdemeanor assault, said attorney Benjamin Ronald. They were sentenced to a conditional discharge that requires them to stay out of trouble for a year, he said.

The cases for two co-defendants, Nouman Khan and Ismaeel Arif Abid Al-Ashoor, were not resolved and will be taken up again in May. Nouman Khan is a former boxing champion who is accused of striking the hardest, causing a fractured skull to one man, and he is facing a gang assault charge.

The high-profile assault case played out on social media shortly after Christmas when Joe Grosvent alleged he and his cousin were beat up by a group of guys downtown. Then Nouman Khan tweeted a seven-second video to local news media that showed someone striking his car before the fight occurred.

"Unfortunately, the video did not capture the fight," Ronald said. "The video made clear who the aggressor was, and it didn't go any further than that."

An eyewitness was later identified and claimed to have seen the four defendants involved in the fray. That eyewitness was instrumental in getting charges against all four suspects, prosecutors have said.

• Grosvent describes his version of being attacked

• Christmas night assault suspect, in his own words, says fight was self defense

The cooperating eyewitness was on her way home after spending Christmas with family and friends. She stopped her vehicle, got out and begged the combatants to stop fighting, prosecutors have said.

Meanwhile, at least two other vehicles stopped in the street to watch the fight but did not intervene, Manfredi said. Some of those witnesses may have shot video of the fight, but have not come forward.

Nouman Khan and Abid Al-Ashoor are due in court May 10.