The Massachusetts teenager prosecutors say was coerced into killing himself by text messages from his girlfriend had researched suicide online, a defense witness testified Friday.
According to a forensic investigator on the case, Conrad Roy III googled a variety of suicide methods on a website that explained "easy, quick and painless ways to commit suicide."
Roy's girlfriend at the time, Michelle Carter, could be tried as an adult if convicted.
Carter, now 20, was 17 when 18-year-old Roy died of carbon monoxide poisoning in his pickup truck in a store parking lot in Fairhaven. She is charged with involuntary manslaughter.
The Carter trial is scheduled to resume Monday.
--The Associated Press contributed to this report.