Del

Del was a demon under the employ of Crowley. He was incharge of taking care of prisoners in a Castle Storage facility in Wichita, Kansas.

Season 9
He was keeping an eye on a woman named Candy as well as Mrs. Tran. He was instructed not to kill any prisoner, but he killed Candy when she tried to escape. He wanted to quit as he was getting frustrated due to Crowley's absence. When the Winchesters came looking for Kevin's mother, they killed him.