The American boss of a $50 billion investment firm was found dead in a locked bedroom in his rented London mansion after a “screaming” argument with his wife, an inquest heard. Joshua Pack, 51, was co-CEO of the investment giant Fortress – which owns the well known British brands Majestic Wine, Poundstretcher, Punch Pubs and the Curzon cinema chain – and had relocated to London to oversee the firm’s regional growth. The father-of-four and his wife had had an argument over plane tickets with both threatening to kill themselves, a London court was told. But senior coroner Professor Fiona Wilcox said she could not be sure Pack’s death was suicide and said it was more likely an “impulsive’ act. Jacqueline Pack told the inquest her husband had once ‘dramatically’ jumped off a hotel balcony after they had argued (Triangle News) On September 29 last year, he was found in a locked bedroom of the mansion he had rented with his childhood sweetheart Jacqueline in the affluent St John’s Wood area.…