Dave released the following statement on his facebook page last night:
This isn't the first time Dave has left the band. There were brief stints in the 80's where he'd bail and they'd tour with different drummers but it was pretty clear Lombardo, one of Slayer's founding members, belonged behind the kit. He would return and then they'd record another awesome album and the Slaytanic show rolled on. This lasted until 1992 when Dave permanently quit the band to pursue other musical endeavors and spend time with his family. Slayer continued touring and recording after his departure but their musical output for most of the 90's, aka the non-Lombardo years, are hardly noteworthy. In fact it wasn't until Dave rejoined the band in 2002 that Slayer began their current wave of rejuvenation and success.
I'll leave you with what is probably my favorite Dave Lombardo video around, one that I know I've already posted in the past but its just that damn good...