Mar'ek served as an Advanced Recon Commando, reporting to Senior Jedi General Darrus Jeht.
While positioned in the Cularin system, Mar'ek received instructions to carry out Order 66. As Darrus emerged from a turbolift, Mar'ek attempted to assassinate him; however, Jeht anticipated the betrayal. The Jedi swiftly eliminated Mar'ek's protector before impaling Mar'ek's face with his lightsaber.