John Cena, Ric Flair and more stars paid tribute to the late wrestling legend Hulk Hogan after his death at age 71 on July 24. Ric Flair spoke with PEOPLE.

According to a report by Pinellas County Forensic Science Center in Florida, Hogan died from acute myocardial infarction, which is more commonly known as a heart attack. The cardiac arrest was deemed to have been the result of natural causes. The New York Post was first to report Hogan’s cause of death.

Cena has squared off with several of his past foes with the roles reversed and him playing the bad guy. He defeated Cody Rhodes for the Undisputed WWE Championship at WrestleMania 41 and has since successfully defended it against Randy Orton at Backlash and CM Punk at Night of Champions.