A 15-year-old boy stabbed another teenager to death with a “Rambo-style” knife during an argument over a phone charger, a jury has heard. The defendant, who cannot be identified due to his age, is accused of murdering Tyrone Hayman, 17, in Bristol. Jurors heard the pair were in Tyrone’s flat in Bedminster, south of the city centre, when the incident took place shortly before 1.30pm on 14 December. The trial of the boy, who denies murder, is the first to take place at Bristol crown court since the Covid-19 lockdown. Adam Vaitilingam QC, prosecuting, said: “The two of them had an argument over the use of a phone charger that they were both using. “During the argument, the defendant picked up a knife and he stabbed Tyrone. The knife went into Tyrone’s chest and through to his heart. Tyrone ran out into the street. “Paramedics were shortly on scene but there was nothing that could be done to save his life.” He said the defendant cycled away from the flat. Vaitilingam told jurors there was “no dispute” that the defendant had stabbed Tyrone. He said the boy initially refused to answer questions from police but had since provided a statement to the court. “It claims that the stabbing was an accident,” Vaitilingam said. “He says he was holding the knife when Tyrone came towards him play-fighting. He says Tyrone accidentally impaled himself on the knife.” Vaitilingam said it would be for jurors to decide whether the incident was murder or a “terrible accident”. The court heard that a girl in the flat with Tyrone and the defendant described the weapon as a “Rambo-style” knife. She told police that the knife, which has never been recovered, belonged to the defendant. A postmortem examination found Tyrone died from a single stab wound to the left side of his chest. Before the case was opened, the judge, Mr Justice Garnham, spoke to jurors about how the court would operate. He said the trial was one of the first in England and Wales to take place since the coronavirus pandemic. “The criminal justice system is a vital part of how we live together as a community and your role as jurors is a vital part of that system,” the judge told the panel. Every person attending court was asked to confirm that they did not have any symptoms of coronavirus. The judge said anyone who sneezed or coughed must use a tissue, dispose of it carefully and sanitise their hands. “You will already have experienced and seen the way that this building and courtroom have been adapted,” he said. “There is a one-way system around the courthouse and marked areas with seats and tables to maintain social distancing.” Jurors were seated around the court, 2 metres apart, rather than in the jury box. Three courtrooms, which will be regularly cleaned and ventilated, will be used for the case. The trial, which is expected to last up to five days, continues.