Err...
1) Fell out
2) Rotted away
3) Taken off as bow ties not normal zombie apparel
(http://www.educationalsynthesis.org/files/images/ppl/famamer/360x356xLArmstrong-Cover.jpg.pagespeed.ic.dOIg0YKXB8.jpg)
(
MonkeySandwich eats a kitten, leaves a chair,
Wed 6 Jul 2011, 11:58,
archived)