Eddie died of heart failure. It happened while he brushed his teeth. It had to do with workouts and pushing himself physically resulting in his heart being unable to function. His heart just couldn't go on.
The guy is a very charismatic wrestler and will be missed by everyone. I got to see him in action when the WWE came out to Australia earlier in the year, and it was truly a sight to see him interact with the crowd after watching him on TV for so long. The fact that he's been sober and clean of drugs for four years shows how strong he is mentally.
The WWE is holding tributes to Eddie in the RAW and Smackdown shows (since RAW has already aired, go and watch the Smackdown show) and judging by the writeup of the RAW show, it truly is a tribute to Eddie.
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That's pretty rare in wrestling as most wrestler deaths involve retired guys or guys working indys.
Two words: Owen Hart. That was the most recent tragedy apart from this. The Benoit-Bret Hart match that they had after Owen passed away was something really special. Go find it on the net if you don't believe me.
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I wish JR had been there to announce, though.
He's still recovering from surgery. I'm sure he'd have loved to be there, and sends his love to the family of Eddie.
Viva La Raza!