Colorado’s long-awaited cinema massacre trial began yesterday, with jurors asked to decide whether gunman James Holmes was insane when he killed a dozen filmgoers in 2012, or a calculating mass murderer who deserves execution.

John Mark Karr, the suspect in the killing of six-year-old JonBenet Ramsey, arrived in the US after a 15-hour flight from Thailand on which he sipped champagne, dined on fried king prawns and roast duck, and exchanged what he described as “small talk” with law enforcement escorts.