Nick Hogan paid tribute to his dad, Hulk Hogan, who died last week at age 71, in an emotional post on Instagram. Nick posted Saturday night that dad Hulk, who died Thursday of a reported cardiac arrest, was his “hero” and “best friend.”

Hulk Hogan's close friend Jimmy Hart talks exclusively to PEOPLE about the WWE star's health in his final days and reflects on his friendship, after Hogan's death on Thursday, July 24.

Wrestling icon Hulk Hogan died on Thursday at the age of 71. Perhaps the most well-known and recognizable wrestler in the history of the industry, he was a major catalyst in the growth of the World Wrestling Federation throughout the 1980s.