man, i cant remember.
I got a question for yall. Am I the only that WWE on demand??? 
If you mean on the storyline...it was when The undertaker covered him with cement.
Here's the source:
For the June 27, 2004 PPV The Great American Bash, a match pitting Undertaker against both of the Dudley Boyz was booked. Paul Bearer would be encased in a glass crypt backstage, covered up to his chest in cement. In the storyline, Heyman demanded that Undertaker throw the match or else see Bearer suffocated in cement. By the time of the PPV, Pringle had recovered from his latest operation and would appear on-screen.
Undertaker won the match but proceeded afterwards to pull the lever that sent cement into the crypt, completely burying Paul Bearer and, in kayfabe terms, suffocating him. (Bearer was in the crypt throughout the event but was replaced with a stunt double for the burial (who when having huge plants on him, it appears that isn't Bearer because he appears younger). This shot ended the PPV and caused numerous complaints toward WWE, as in essence they had shown a (kayfabe) murder. However, the live audience saw an extended ending in which Bearer surfaced for air and was carried from the arena on a stretcher. On the following week's SmackDown!, Bearer was acknowledged to be alive, although gravely injured, for kayfabe purposes. The rehearsal taping earlier in the day of the Bash - with Undertaker ad-libbing and only half of the stunt complete, in an empty arena - was leaked onto the internet dirt sheets and actually broadcast live by accident in many of the TV markets. However, having two years remaining on his contract, Bearer's WWE career wasn't over; he was used as a booker for the company up until WWE decided to terminate his contract, giving him ninety days notice on April 11, 2005.
In real life, he still running his funeral home in Mobile, Alabama.
