Marius Sewell is a member of Deadlock Gang. He is the nephew of Silas Sewell and the older brother of Phineas Sewell.
He was employed as a weapons trafficker until he was betrayed by Jesse McCree, who assisted the authorities in his arrest. He is currently serving his imprisonment at the Penitentiary of New Mexico.
- The character of Marius Sewell was created by Oogaman.