Tilikum (c. December 1981 January 6, 2017), nicknamed Tilly, was a captive killer whale who spent most of his life performing at SeaWorld Orlando. He was captured in Iceland in 1983 at Hafnarfjrur, near Reykjavk. About a year later, he was transferred to Sealand of the Pacific in Victoria, British Columbia. He was subsequently transferred in 1992 to SeaWorld in Orlando, Florida. He sired 21 calves, of which nine are still alive as of 2021. Tilikum was heavily featured in CNN Films' 2013 documentary Blackfish, which claims that killer whales in captivity suffer psychological damage and become unnaturally aggressive. Tilikum was involved in the deaths of three people: Keltie Byrne a trainer at the now-defunct Sealand of the Pacific, Daniel Dukes a man trespassing in SeaWorld Orlando, and SeaWorld trainer Dawn Brancheau. Description Tilikum was the largest killer whale in captivity. He measured 22. 5 feet (6. 9 m) long and weighed about 12, 500 pounds (5, 700 kg). His pectoral fins were 7 feet (2. 1 m) long, his fluke curled under, and his 6. 5-foot-tall (2. 0 m) dorsal fin was collapsed completely to his left side.