A teenage boy accused of stabbing a nine-year-old girl to death has pleaded not guilty to her murder. The 16-year-old, who cannot be named because of his age, is charged with killing Aria Thorpe in Weston-super-Mare, Somerset, on 15 December last year. Aria was pronounced dead when police were called to her home in the Mead Vale area of the town at 18:09 GMT that day, and a coroner's court later heard she died from a single stab wound to her chest. On Friday, the boy appeared before Bristol Crown Court where he spoke only to enter his not guilty plea to murder, and a trial was listed for 15 June. In a tribute, Aria's father Tom Thorpe described her as a "brave, kind-hearted and a beautiful innocent soul". Aria's family on her mother's side said she was "the most beautiful little soul – happy-go-lucky, full of light, and joy". The defendant was arrested in nearby Worle at 18:19 on the day of her death.…