Found this on the AV club:
Comments after review of Ep 4
The Walking Dead Mortality Threat Index
Levels: Safe > Moderate > Substantial > Severe > Critical
Rick: Safe - Heroes don't die (in mid-season). Heroes suffer.
Lori: Substantial - Rick or Shane failing to adequately wrap it up should earn Lori a nine month stay of execution. But despite everything, she Will still nip off in the middle of the night to piss in a field on the edge of a zombie forest. No change.
Shane: Substantial - A respite from imminent danger earns ol' Shane a downgrade. Let's be clear though: He's a heel, feels no guilt over throwing one of his team to a pack of zombies and is practically begging for a confrontation with Rick that he has to lose. Practicality determines he must survive. The law of screenwriter morality says otherwise.
Daryl: Moderate - Like a version of Shane but with loyalty and a spirit that hasn't been killed stone dead; not that he would express it that way.
Andrea: Substantial - Emotional issues veer wildly between does-what-needs-to-be-done ruthlessness and suicidal recklessness. Holding steady at Substantial; at least she can maintain a weapon now.
Carl: Safe - For now.
Dale: Moderate - Still the team's steadiest head. Watch for fluctuations in competence when out on the road.
Carol: Severe - Fairly safe so long as she stays in the RV. My personal feeling that she should jump down a well shouldn't have anything to do with it, but fuck it.
Maggie: Substantial - Will sex you in an abandoned zombie town just on the assumption that the area is clear of immediate danger. Now that her relationship with Glenn has been consummated, it's reasonable to suppose that she's inching closer to death every minute - for the evulz.
Glenn: Safe - Screams (and copulates) like a girl, but gets the job done even in the face of zombie biting. Will go far, this one.
Patricia: Severe - Only a matter of time.
Herschel: Moderate - Came into conflict with Rick this episode - which I believe is the leading cause of death outside of zombie attacks. Happily they managed to halfway work it out. What's he got in the barn, though? Im guessing whatever it is, it'll probably kill him. Or Patricia.
T-Dog: Substantial - Still almost totally worthless, though did display some impressive ruthlessness in the despatch of Well Zombie that should stand him in good stead in situations to come. Earned a downgrade.
Sophia: Substantial - The fact they're still carrying on with this plot shows that Sophia will return. Why, I don't know, but we can be sure she won't kick it. Yet.