SEOUL, South Korea — A South Korean boxer who lost consciousness after winning an WBO intercontinental flyweight bout last week has been declared brain dead.

Choi Yoi-sam was declared brain dead today after a series of brain tests, said Ko Seung-kwan, a spokesman at Asan Medical Center. Choi had been in a coma since shortly after winning the fight against Indonesian challenger Heri Amol in Seoul on Dec. 25.

The 33-year-old Choi was knocked down shortly before the end of the 12th and final round, but got back up and was declared the winner on points before collapsing.