The troubled multi-millionaire co-founder of online fashion giant Asos has died after mysteriously plummeting from an 18-story building in Thailand. Quentin Griffiths, 58, was found dead at the foot of the luxury hotel where he had been living in the seaside resort city of Pattaya on Feb. 9, the BBC reported . Griffiths, a British citizen, had been alone in his 17th-floor suite and had left the door locked from the inside, a police investigator told the outlet. There were no signs of a break-in