Click to see Spoiler:
Half sack was killed off because he wasn't happy with his character and wanted off the show

Abel's kiddnapping destroys Jax & Tara's relationship

Chief Unser steps down and Hale takes over, but Hale is soon compromised as he is faced with decisions that are illegal but will help Charming in the long run ( kinda stuff Unser did everyday)

Georgie the porn king MAY of not been Luann's killer.