A 21-year-old will continue to serve out his 20-year sentence for a double murder after losing his appeal.Darronte Dill took his case to the Court of Appeal last year, with defence lawyer Mark Pettingill arguing that he should be cleared over the brutal slayings of Maxwell Brangman and Frederick Gilbert.The men, who were homeless and aged in their 50s, were stabbed and killed by Dill as they slept in a shed in St David’s in the early hours of September 21, 2008.Dill had an accomplice, but is the only person brought to justice over the murders. He was convicted after a trial in December 2009.The three judges of the Court of Appeal dismissed his case during a brief hearing this week. Dill showed no emotion.