One of three men charged in a 2015 homicide has pleaded guilty.

Kyle Lamar Purvis, 22, pleaded guilty to first-degree murder and conspiracy to commit murder. Prosecutors will not pursue charges of murder by mob and shoot or stab in commission of a felony.

Purvis is the first conviction in the case of the murder of 20-year-old Donta Williams of Portsmouth. According to court documents, he was attacked on a pedestrian bridge over a North Suffolk lake on Jan. 20.

An employee at the Department of Defense complex at Lake View Technology Park, located off College Drive near Interstate 664, spotted Williams’ body in the lake between Burbage and College drives on March 9.

Court documents reveal Williams was choked and beaten before his body was pushed into the lake.

Also charged in the case are Tremayne Laron Johnson, 26, and Nathaniel C. McCoy Jr., 22.

McCoy is set for trial Aug. 29-31. In Johnson’s case, a new attorney had to be appointed, so his next court date is June 13, and a trial has yet to be set.

Purvis’ sentencing is set for Sept. 14.