Prior to the outbreak, Boone was fighting in Afghanistan along with the rest of his squad which included a lot of members that would eventually become the Reapers. Upon returning from war, he struggled to find jobs or deal with trauma, but the relationship between him and his comrades remained strong. He then decided to become a mercenary.
During the beginning of the outbreak, as Operation Cobalt was put into action in an attempt to try and contain the undead threat, Pope and a group of his people managed to escape the bombings by running until they reached an abandoned church, where inside Pope was amazed to see none of them had been killed or injured, leading him to view him and his comrades as "the chosen ones". It is unknown if Boone was present during this revelation. Regardless, he eventually joined the Reapers, and either found or crafted his own mask with a monochrome black-white pattern and a pair of fangs on it, and would use this mask as a scare tactic against those who were "marked" by Pope.
Boone and at least a dozen Reapers appear on a dark road adorned on both sides with bodies hanging from posts. Suddenly, the Reapers open fire on Maggie and her group, killing Roy and severely injuring Cole. As the Alexandrians flee into the woods, the Reapers chase after them.
While Daryl is being taken in for interrogation by Carver and Powell, Boone can be seen amongst his comrades within Meridian. Boone is present at Daryl's initiation, waiting outside with all the other Reapers for the inductee to pass the test. As Pope declares Daryl "forged by fire", Boone and the rest of the Reapers welcome Daryl with a latin mantra. He is later seen at a bonfire where the Reapers are eating dinner. He later watches in silence as Pope burns Bossie alive for presumed betrayal, claiming he allowed Michael to be killed in order to save himself.
Boone is present when Pope and the rest of the reapers are observing the herd. When Maggie lets in a herd of walkers, he helps clear them with Fisher and Austin. Later, Gabriel begins shooting at Boone with a sniper but he manages to take cover. After Leah kills Pope and radios everyone that Daryl murdered their leader and is with the enemy, Boone arrives with Brandon Carver seconds after Daryl manages to escape. Leah instructs them to close the gates and kill everything inside the walls. Boone returns to the courtyard to help clear the herd until he is ordered to retreat.
Boone is seen with the remaining Reapers meeting with Maggie's group. Daryl offers to trade Carver while letting Leah and the others leaving peacefully. After Gabriel kills their sniper, Leah takes the deal. However, a vengeful Maggie kills both Boone and Washington in cold blood as Leah manages to flee, only being grazed in the shoulder by a bullet.
- Killed By
After deciding against letting the Reapers go due to Elijah reminding her of her promise to get revenge upon all of them, Maggie shoots Boone in the head.
This list shows the victims Boone has killed:
- Ms. Adams (Possibly)
- Teresa (Possibly)
- Roy (Possibly)
- Duncan (Possibly)
- Numerous counts of enemy combatants (Pre-Apocalypse)
- Possibly unnamed Meridian residents
- Numerous counts of zombies and unnamed people
- For an unknown reason, Boone is not mentioned in the Talking Dead memorial for "No Other Way".
- In "No Other Way", Boone wields a weapon similar to the mace Rick Grimes uses in Season 9.