An American teenager has been found guilty of the first degree murder of two British tourists in Florida. James Cooper, 25, from Warwickshire, and James Kouzaris, 24, from Northampton, were shot dead on a public housing estate in Newtown, Sarasota. The pair, who met at Sheffield University, were killed after drunkenly wandering into the estate in the early hours of 16 April 2011. The court heard Shawn Tyson, 17, killed them after trying to rob them. Tyson, who was tried as an adult despite being 16 at the time of the shooting, faces life in prison with no chance of parole. 'Shattered soul' The families of Mr Cooper and Mr Kouzaris were not in court but said in a statement they were satisfied with the verdict. They added: "It is a fact that we were given a life sentence when our sons were so brutally and needlessly taken from us. "Ours is a life sentence, with no chance of parole from a broken heart, and a shattered soul." Mr Kouzaris and Mr Cooper had been out drinking in downtown Sarasota before they were shot The families also criticised the Sarasota court system that freed Tyson after a judge warned he was a danger to the public. Hours before he shot the two Britons, Tyson was arrested for a separate shooting incident in which no-one was hurt. In the statement the families said: "The evil of the killer is one thing, but the fact is, he would not have been on the streets had instructions to keep him incarcerated been passed from one judge to another." Killer's boast When the mistake came to light the Mayor of Sarasota, Kelly Kirschener, vowed the city's prosecutors would never let anything similar happen again. During the trial jurors heard how Mr Kouzaris and Mr Cooper had been out drinking in downtown Sarasota before getting lost and wandering into the Newtown area in the early hours. The prosecution said they were confronted by Tyson who tried to rob them and then shot them when he realised they had very little money. The court heard Tyson had boasted to his friend Latrece Washington, who testified against him, that one of the men had begged for his life but he shot him anyway.