You were in Georgia years after the outbreak occurred. You went to King County which was now abandoned. You walked a while until you found an abandoned house filled with walkers and accidentally released them, causing them to fill the county and you to go taking refuge in an abandoned house.

Upon arriving, you found a woman, who was taking refuge at the house due to the walkers and saw you accidently release the walkers onto the streets.

"Well you certainly did a good job at that"