Thanks to Anon for the following
On RoamersandLurkers (the biggest Walking Dead forum), there's this member who claims that he's part of the production team. He's leaked spoilers for the second half of the season, including Shane's fate. Of course we all have to take this with a grain of salt, but I thought it was interesting to get it out to you guys
Nebraska is an awesome episode, most likely one of the best, has nothing to do with Nebraska.
Hershel goes into town to a bar to drown his sorrows with alcohol, Rick and Glenn go after him.
They find him drinking long story short, 2 guys walk in out of nowhere and essentially fake being nice all along wanting to know where they are staying so they can go raid and rape etc. Rick pretty much goes cowboy on em and kills em both. Hershel has a new found admiration for him after this.
Anyway after awhile a bunch of people come looking for their friends and finally find out and there is a fire fight between Rick's people and the others, many of them.
Almost forgot, "Nebraska" is mentioned in their conversation, they tell Rick that maybe Nebraska is a good place to go and after some verbal sparring Rick essentially tells them to !@#$ OFF to Nebraska.
Shane does not make it through the season, essentially Lori puts into his head that if Rick wasn't around they would still be together. This makes Shane change AGAIN, (he had finally made peace and Lori fucked him up again). Anyway he decides to kill Rick and lures him into the forest chasing after someone you will meet in "Nebraska". Of course Rick isn't stupid he realizes nothing is adding up and tries to give Shane a chance to abandon his plans. Believe it or not Rick loves Shane like a brother, anyway he finally calls Shane on it and Shane basically tells him how Carl and Lori will get over his death. Shane has a gun pointed at Ricks face and seconds away from shooting, when Rick starts to negotiate his way out of it, all along pulling a knife out. Long story short he lunges at Shane and buries the knife in his chest.
Even worse HERES A BIG SPOILER.
SHANE COME'S BACK TO LIFE AS A ZOMBIE! - Carl shoots him, the whole thing is pretty fucked up.
All this causes Rick to slowly change into a Shane if you will, believe me the show is going somewhere so crazy that Shane's death will not even be a burden, he served his purpose by helping Ricks character transform.