Beings killed by Arthur Ketch.
Demons
Regular Demons
- One of the Bar Attackers - Stabbed with an angel blade.
Monsters
- Countless unnamed monsters - Killed over the course of his career as an assassin for the British Men of Letters.
Vampires
- An unnamed vampire - Decapitated after it was captured by the British Men of Letters.
- Dozens of unnamed vampires in America - Killed with Mary Winchester during Project V.
- Countless unnamed vampires - Killed over his career as an operative for the British Men of Letters.
Humans
Hunters
- Eileen Leahy - Killed by Arthur's hellhound on his orders.
- Six unnamed hunters - Killed by Arthur's hellhound on his orders.
British Men of Letters
- Lady Toni Bevell - Slit her throat in the Men of Letters bunker.
- Mick Davies - Shot in the back of the head with a silenced pistol on the orders of Doctor Hess.
Psychics
- Magda Peterson - Shot twice with a silenced pistol on the orders of the British Men of Letters.
Witches/Magic Practitioners
- Three unnamed witches - Tortured and their throats slit in his search for Rowena MacLeod.
Regular Humans
- Agent Camp - Throat slit on the orders of the British Men of Letters.
- Pvt. Norton - Throat slit on the orders of the British Men of Letters.
- Rick Sanchez - Throat slit on the orders of the British Men of Letters.
- Six unnamed soldiers - Throats slit on the orders of the British Men of Letters.
- D. Winters - Throat slit on the orders of the British Men of Letters.
- Countless unnamed humans - Assassinated on the orders of the British Men of Letters.