Well, another high five to the freepers for killing Andy, but I'm not sure they really pulled the trigger.
He died from surgical complications, caused by a bigass dust bunny that blew into the operating room and settled into his incision.
At the time it happened, his surgeon was trying to stomp a fast-moving silverfish, and didn't immediately notice the big wad of floating dust.
Having already removed half a pancreas, a big chunk of liver, two gerbils, and a small reptile, the surgeon was overworked; a dustball simply didn't seem that important.