(IDEX Online) - The owner of the Tiffany & Co jewelry empire in Turkey died after plunging from a cruise ship off the coast of Tahiti, in the South Pacific.Relatives of Dilek Ertek, 71, believe CCTV footage shows her falling to her death at 3am, but say her partner, 74, did not report her missing until 20 hours later.He was questioned by police in Tahiti when the Norwegian Spirit cruise ship (pictured) docked three days later, but was released without charge and is reported to have since returned to Switzerland.Ertek studied at the GIA (Gemological Institute of America) in New York, opened Istanbul's first Tiffany & Co store in 1995 and distributed the company's jewelry in Turkey for 20 years.