He was the guitarist for Pantera, Damageplan and Rebel Meets Rebel (with David Allan Coe). Dime is/was arguably one of the Greatest Metal guitarists of all time, easily in the top 10.
If one who is not familiar with him would like to check out his work I would suggest "Cemetery Gates" by Pantera...
http://www.youtube.com/watch?v=RVMvART9kb8
Ironically and sadly both were shot and taken away from us way before they had finished sharing with us their beautiful talents.
But both left unmeasurable marks on their respective genres and changed music in general forever.
The only consolation is that Dime died on stage doing something he loved.