An illegal immigrant has confessed to killing American artist Ashley Olsen in her Italian apartment, who was punched and strangling her with a USB cord in a jealous 'drug-fueled' frenzy. Cheik Tidiane Diaw, 25, told officers he strangled Olsen after the pair had sex when she told him he had to leave because her boyfriend was coming back. The Senegalese man was caught because of DNA evidence from a used condom and cigarette found in the toilet - which he had tried to flush away unsuccessfully. Italian police said they had to swoop on him quickly because they feared he...