There is now, and there has always been only one Ultimate Warrior - Jim Hellwig. Who legally had his name changed to "Warrior". I guess "Frickin' Tool" was taken.
The guy who died played a Warrior knockoff in the WCW called the Renegade. His name escapes me right now. He committed suicide.
The wrestler who had his leg cut off was Kerry Von Erich. He played a Warrior looking wrestler by the name of the Texas Tornado in the WWF. He lost his leg (below the knee) in a motorcycle accident (prior to his stint in the WWF) but continued to wrestle with a prostetic. He is also dead (as is most of the Von Erich family)