- "Don't move, assholes."
- —Derek to Gabriel and Dr. Carson[src]
Nothing is known about Derek's life prior to or as the outbreak began.
At some point in the apocalypse, Derek somehow came into contact with a group named "The Saviors" which he subsequently joined.
Derek reads a map on the hood of his pick-up truck, trying to search for the missing Alexandrians. He and his fellow Saviors get a call on the radio that Father Gabriel and Dr. Carson have gone missing from the Sanctuary along with Jeremy's green Jaguar. He and the other Saviors quickly get in their truck and drive away in search of the two missing prisoners. Later, he and the others find Gabriel and Dr. Carson in a garage and take them into custody. He berates a fellow Savior for shooting Dr. Carson and dumps his body out of the pick-up truck. At the bullet factory outpost, he and Mel drop off a captured Gabriel at the outpost as Eugene's newest worker and leave along with Negan.
During the Saviors' attack on the Hilltop, Derek attacks Tobin with his tainted knife, seriously wounding him. Before he can kill him, Derek is shot by Carol.
This list shows the victims Derek has killed: