A Hempstead man was sentenced Monday to 20 years to life in prison for his role in an attack at a Freeport motel three years ago, acting Nassau County District Attorney Madeline Singas said.

Robert Dixon, 51, was sentenced by Nassau County Supreme Court Justice William Donnino in Mineola. A jury had found Dixon guilty of first-degree assault after a nine-day trial in January.

Prosecutors said Dixon and co-defendant Wayne Speaks, 48, assaulted an Amityville man on July 13, 2012, after a dispute with a woman at the South Main Street motel about 3:45 a.m.

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The victim had gone to the motel with the woman, whom he met online, and was willing to pay for sex, prosecutors have said.

"This defendant took part in a brutal attack in which the victim was outnumbered, held in a chokehold, and viciously assaulted," Singas said in a news release.

Speaks slashed the man while Dixon held him in the chokehold, prosecutors said. The victim suffered cuts to his lip, leg and forehead.

Dixon then knocked out the victim's front teeth with an object that appeared to be a gun, prosecutors said.

The victim was treated at South Nassau Communities Hospital for serious injuries that left scaring, prosecutors said.

The attackers got away with the victim's phone, $200 and his driver's license.

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Speaks, of Uniondale, pleaded guilty in November 2014 to robbery, assault and weapons charges. He was sentenced in January to nine years in prison.

In his trial in January, a jury acquitted Dixon of two robbery counts after 90 minutes of deliberation.

The woman at the center of the dispute, Wendi Seletsky, 31, of Hempstead, pleaded guilty to second-degree assault in March and, after violating probation, was sentenced to three years in prison.