4:05 PM PT -- TMZ Sports spoke with wrestling icon Shawn Michaels -- who was in the legendary Kliq with Kevin -- about the sad news ... and he says the guys are going to do everything they can to support their friend.
"Our heart goes out to him," Shawn said. "He knows where his Kliq buddies stand ... and we're going to be with him. Just letting him have his time in this time of extreme difficulty and just being there for him and praying for him and we hope that's what everybody will do."
WWE Hall of Famer Kevin Nash's son, Tristen, who recently started working with his father's podcast, tragically passed away this week ... it was announced Thursday.
He was only 26 years old.
No cause of death has been revealed.
Sean Ross Sapp shared a statement on behalf of Tristen's parents, Kevin and Tamara, confirming the terrible news -- adding the family is asking for privacy during this difficult time.