Bicycle Girl (Comic Series)

Hannah was a walker that Rick Grimes encountered after he exited the hospital that he was put in. Hannah was later killed at the end of Issue 1 after Rick, Morgan Jones and Morgan Jones collected the guns from the police station.

Pre-Apocalypse
Nothing is known about Hannah's life before the outbreak. It is possible that Hannah had a family and kids.

After-Apocalypse
Sometime during the apocalypse, half of Hannah's body was devoured. She encountered Rick Grimes by a bicycle. Rick later came back to Hannah and put her out of her misery by shooting her in the head

Killed By
It is unknown or hasn't been clarified but it is possible that Hannah was devoured by a group of zombies. After Rick left the hospital, he came across Hannah, Rick started crying to see the state Hannah was put it, Rick later returned to put Hannah out of her missery.
 * Zombies
 * Rick Grimes