 He also operated on boxer Duk Koo Kim in November 1982, following Kim's loss to Ray Mancini; Kim died as a result of his injuries in the fight.Following Roy Horn's near-fatal tiger attack in 2003, Hammargren spoke up to correct misinformation in the press about the procedure Horn (of Siegfried & Roy) had received.According to Hammargren, he gave up surgery in 2005, when the cost for his malpractice insurance was raised to $275,000/year; in 2009, as part of a medical malpractice settlement, he agreed to give up surgery permanently, though he retained his medical license.