Jonas Rust, secretly the Magician, was a detective in New Orleans.
He helped the Eighth Doctor in his effort to retrieve his stolen amulet whilst investigating a murder. Rust deceived the Doctor, and planned to use his artron energy to astral project himself to Lyon to retrieve the amulet. Rust then summoned a demon to kill the Doctor. This failed and the demon ate Rust. (PROSE: The City of the Dead)