Wrestler Ivan Koloff, known as 'The Russian Bear,' dies at 74

World Wrestling Entertainment star Ivan Koloff has died at the age of 74.

WWE announced the news on Twitter.

Koloff, nicknamed "The Russian Bear," was a rival of star wrestler Bruno Sammartino, and the two had many memorable moments in the ring.

Koloff suffered from liver disease, according to his daughter, Rachel Marley. She started a GoFundMe page to raise funds for medical expenses and encourage fans to send cards and prayers.

Hulk Hogan posted his condolences on Twitter, saying that it had been a rough week for the wrestling community. George "The Animal" Steele and Chavo Guerrero Sr. also died recently.