Pretty close on 50/50: from that list on the photo, 45% are dead, and 55% are alive:
Dead:
Roddy Piper
Big John Studd
Andre the Giant
Jimmy Snuka
Paul Orndorff
Junk Yard Dog
Nikolai Volkoff
Jim Neidhart
Lou Albano
Alive:
Bob Orton Jr.
Ricky Steamboat
Wendi Richter
Hulk Hogan
Hillbilly Jim
Mike Rotunda
The Iron Shiek
Greg Valentine
Tito Santana
Barry Windham
David Sammartino
And yes, I'd say that's even worse than bodybuilding.
Seems like wrestling is the most lethal of them all.
Not really! That poster is about 35 years old.
So, most of those on the "Dead" list either died of old age or things totally non-wrestling related.
JYD was killed in a car accident back in 1998; Neidhart fell down the stairs and hit his head just a few years ago (2018). Andre had acromegaly (doctors predicted he wouldn't make 40; he died in 1993 at age 46, which some claim was due to a broken heart after his father passed away only days earlier).
The only one who died prematurely, of those listed, were Big John Studd and perhaps Piper (who was battling cancer but died of a heart attack).