I read this on the MA forum as well. Supposedly he was always drunk on stage and screwing up songs, which I found hard to believe because the two times I saw Obituary (2009 and 2010) I was right in front of him and he nailed the solos both times.
2/10 - Napalm Death
3/19 - Mike + the Mechanics/Daryl Stuermer
9/30 - Mark Knopfler