Anthony Vincent Waiters of Tracy is the only one of four defendants in the case to go to trial. The other three pleaded guilty earlier this month.
Deputy San Joaquin County District Attorney Angela Hayes used witnesses and photographs Wednesday to show the victim's appearance in December 2008 when he showed up at a gym in Tracy wearing only boxer shorts with a chain fastened to one ankle, The Sacramento Bee reported. Tracy Police Officer Libby Orvick told jurors the 16-year-old, who has been identified only as Kyle Doe, was "very very frightened."
Kyle told police his mother left him in custody of Caren Ramirez, who eventually took him to the home of Kelly Lau and Michael Schumacher in Tracy, where he was kept prisoner. Ramirez, Lau and Schumacher have all been sentenced to at least 30 years in prison.
Hayes in her opening statement said she could prove Kyle was tortured but could not explain why.
"Do not ask me to explain to you why a person would inflict great bodily injury on another person for the purpose of cruel and extreme suffering," she said. "Why they would enjoy that is not a question that has to be answered in a court of law."