The Ultimate Warrior has died ... this according to the WWE.
Warrior -- real name James Hellwig -- was a WWE legend ... and was one of the most iconic wrestlers of all time.
So far, the cause of Warrior's death is unclear. He was 54 years old.
Warrior was just inducted into the WWE Hall of Fame the night before Wrestlemania XXX this weekend ... and last night, he made his first appearance on "Monday Night Raw" in years.
Triple H just tweeted, "Saddened to announce the passing of the Ultimate Warrior. Icon and friend. My sympathy to his wife Dana and his daughters."
Stephanie McMahon also tweeted, "#RIPUltimateWarrior Your strength of character is to be admired. There will never be anyone like you. Your spirit lives on in your family."
Hulk Hogan -- Warrior's greatest rival -- has also tweeted, "RIP WARRIOR. only love. HH"
WWE posted a message on the official website saying, "WWE is shocked and deeply saddened to learn of the passing of one of the most iconic WWE Superstars ever, The Ultimate Warrior. "
Comment