Ivan Koloff, also known among wrestling fans as “The Russian Bear,” has died. He was 74.

Koloff had been battling liver cancer and was in need of “urgent medical care,” according to  a Go Fund Me Page set up by his daughter, Rachel Marley, on Feb 2nd 2017.

“My dad was diagnosed with liver disease about 10 years ago and while he has been living with it, he chose not to make this announcement public to his fans and friends,” she wrote. “But doctors are now saying that his liver function is getting worse day by day and it will continue to. There are no other medical options available for my dad for a cure.

Koloff was a Canadian professional wrestler, best known for once holding the WWWF World Heavyweight Championship.