A jury has found 17-year-old Shawn Tyson guilty of murdering two British tourists in Sarasota last April. Jurors needed only around two hours this afternoon to return guilt verdicts against Tyson i the slayings of James Cooper and James Kouzaris, who had apparently wandered into Newton by accident after a night of drinking. Though no eye-witnesses were presented and the murder weapon has not been located, prosecutors sent a parade of witnesses to the stand to testify that Tyson talked about the killings and admitted he was the trigger-man. Due to his age, Tyson is not eligible for the death penalty. He was sentenced immediately to life in prison.