Tyler Mercer
From Tardis Wiki, the free Doctor Who reference
Lieutenant Mercer was a crewmember of the Prison Station on which Davros was held as a prisoner.
He was one of the few initial survivors of the Dalek raid on the station. He led the attempt to activate the station's self-destruct mechanism, but failed. He was later shot and killed by one of Lytton's mercenaries. (TV: Resurrection of the Daleks)