The writers said a reason for killing the character was so they could explore her backstory in a mysterious and posthumous way .
Libby is one of the few main characters not to have a centric episode detailing her life before the crash .
The writers said a reason for killing the character was so they could explore Libby 's backstory in a mysterious and posthumous way .
Libby is one of the few main characters not to have a centric episode detailing her life before the crash .