NFL Hall-of-Fame linebacker and occasional WCW wrestler Kevin Greene passed away Monday at the age of 58 with cause of death still unknown.

Best known for his time with the Pittsburgh Steelers, Greene ranks third all-time in sacks with 160 and was a two-time All-Pro and five-time Pro Bowler.

Wrestling fans will remember Greene’s appearances for WCW in 1996 through 1998 as he worked in both singles and tag team matches with some of the company’s top stars.

He teamed with fellow former NFL player Steve McMichael at the 1996 Great American Bash in a losing effort to Ric Flair and Arn Anderson. McMichael turned on him and joined the Four Horsemen. 

He returned in 1997 to team with Flair and Roddy Piper in a victory over NWO members Kevin Nash, Scott Hall and Syxx (X-Pac) at Slamboree. A month later, he got revenge against McMichael in a win at the Great American Bash.

After another year-long absence, he returned to take on The Giant (Big Show) on a June 1998 edition of Nitro, winning in a quick DQ. The Giant would beat Greene a month later at Bash at the Beach in Greene’s final match.