I just started reading the comics (someone at work let me borrow his compendium), but I'm already totally spoiled thanks to this (very addictive) site:
http://walkingdead.wikia.com/wiki/The_Walking_Dead_Wiki
So, yes, some very, very bad things happen in the comic. I'm actually very curious to see how much of it makes it to the screen... this is basic cable after all.