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- "It was early on. Aaron found me. I was alone, lost everything... everyone. Myself, I-- I wasn't crazy. I just gave up on being someone, an actual person. Know what I mean? (...) We found Betsy on the way back to the community. She still saw me. After I thought I was dead and gone, she was my first friend. Then she was more. She made me more. Even better than how I used to be. But if I could make it back, I'd want to say goodbye. Tell her... finding her in all this, that was everything."
- —David to Michonne about how he found Alexandria and his wife[src]
Nothing is known about David's life before or during the outbreak. It is likely that he lived near Alexandria before the apocalypse.
After the apocalypse started, David lost everyone and was left all alone until Aaron found him and brought him to Alexandria. On the trek to Alexandria, they found Betsy, who he befriended and eventually wed as his wife.
David is one of the townspeople to attend the meeting at Deanna's house regarding how to handle the mega herd at the quarry. He volunteers to help construct the wall out on the road that is designed to deter the horde of zombies along a route away from Alexandria. David is also present at the quarry going over Rick's plan when suddenly the zombies break free, forcing him and the others to scramble to their positions.
David and the rest of the group run through the woods towards Alexandria, with half of the herd on their heels. While Rick talks to Glenn and Michonne in private, David and the others watch in horror as Barnes has his throat ripped out by a walker and is put down by Michonne. After Rick leaves for the RV, David along with his remaining group continue on. They go into a panic when walkers attack; David receiving a walker bite on his back. They survive the ordeal without Sturgess, who had fled into the woods out of fear, while Scott sustains a bullet accidentally fired by Sturgess to his leg.
David and the group move on. He talks to Michonne about how he lost everything to the apocalypse and that a woman by the name of Betsy brought him back. He wishes he could see her one last time. At an abandoned town, David and the group take refuge in a pet store after finding Sturgess' body and being cornered by more walkers. While Glenn and Nicholas head out to lure the walkers away, the others sit quietly, watching walkers pass by the storefront. Michonne sees David writing a farewell note to his wife. When he tries to hand it to her, she refuses to take it. "You're getting home," Michonne writes on her arm. The walkers that had been lurking in the back room of the store begin pounding on an interior door, drawing the attention of the walkers outside. Michonne kills them, but the walkers outside have been attracted.
David and the others leave the pet store, guns blazing. Annie is devoured while the others reach a gate and climb over it. As David and Michonne climb over, walkers claw at them and drag David down to be devoured. His note to his wife is last seen being stepped upon by the walkers that are eating him.
A zombified David is stumbled upon by Glenn Rhee at the fence where he died. He lifts himself off the gate and looks at Glenn briefly before Glenn puts him down.
This list shows the victims David has killed:
After exiting the pet shop, David and the group come upon a fencing area. As they start to climb over it, walkers grab and claw at the feet of Michonne and David. However, walkers pull David down and begin to devour him as the group looks on in horror. He is later found as a walker by Glenn and is put down.