Crane (Rise of the Cybermen)

Mr. Crane was a trusted employee and, perhaps, friend of John Lumic, supervising both the capture of homeless people and the cyber-conversion of the homeless into Cybermen. Crane turned on Lumic when the Cybermen almost "upgraded" Crane as well, and ripped out the life support systems built into Lumic's chair. As a result, his Cybermen caused Lumic to have an emergency upgrade and Crane was killed by a Cyberman.