Following a four-day jury trial, Chad Lester, a former lieutenant at the Southern Regional Jail in Beaver, West Virginia, was found guilty yesterday of conspiracy, witness tampering, and giving false statements to the FBI. The charges arose out of a staff assault of an inmate named Quantez Burks, who later died from injuries he suffered during the assault. Seven correctional officers pleaded guilty in connection with the assault of Burks; several of those former officers testified against the defendant during the trial. The defendant faced charges related to his efforts to obstruct the investigation into the assault.