THE STRANGE case of mysterious skyjacker DB Cooper just took another bizarre twist when it was revealed that the stewardess who dealt with the thief, then spent 10-years in a nunnery - possibly as part of the witness protection programme. Tina Mucklow was praised for her calm handling of the man, who called himself Dan Cooper, who in 1971, boarded the Seattle to Portland plane and claimed to have a bomb strapped to his chest.