Killed by Crowley

“	I have watched you kill people Crowley, innocent people! People I cared about! People I loved!	”
	— Sam Winchester to Crowley in The Prisoner

Beings killed by Crowley.

Angels

Adina - Slit her throat with an angel blade to steal her grace then stabbed her through the chest with the angel blade.

Unnamed Crossroads Demon - Ordered to have him cut in half and his remains pinned to the door at Rowena's suggestion.
Himself - Killed himself with an angel blade in order to seal Lucifer in an alternate universe.

Crowley's Trusted Advisors (presumably) - Presumably executed by Crowley for betraying him to Abaddon.
One of Abaddon's Demon Army - Stabbed in the side with an angel blade during a fight in Cain's house.
Crowley's Captors - Stabbed with an angel blade while escaping Lucifer's custody.
Bearded Demon - Stabbed in the chest with an angel blade.
Executed Demon - Executed on Crowley's orders with an angel blade for treason.
Messenger Demon - Stabbed with an angel blade for losing his mother.
Gerald - Stabbed through the neck with an angel blade.
Two of Crowley's Mansion Guards - Shot in the head with the Colt.
One of the Tablet Hunters - Stabbed with an angel blade after the demon failed him too many times.
Jervis - Stabbed in the chest with an angel blade.
Lola - Stabbed with an angel blade.
Meg - Stabbed in the abdomen with an angel blade.
Simmons - Jumped in front of a blast fired by Crowley from the Rod of Aaron aimed at Lucifer and exploded into dust.
Spevak - Killed in order to hide the secret behind Spevak's vessel-controlling system.

Numerous unnamed monsters - Tortured and killed by Crowley in his search for Purgatory.

Alpha Shapeshifter - Decapitated with a machete after he wouldn't give Crowley the location of Purgatory.

Crowley's Shapeshifter Test Subjects - Tortured to death by Crowley while searching for something that could harm the Alpha Shapeshifter.

Ryan and Joe Silver - Killed by demons on Crowley's orders to prevent the Jefferson Starships from spreading.
Silver Brothers' Uncle - Killed by demons on Crowley's orders to prevent the Jefferson Starships from spreading.

Eleanor Visyak - Tortured to death alongside Castiel in order to discover the location of Purgatory.

Sarah Blake - Strangled to death by Crowley with a spell.
Margot Cassity - Killed by his hellhound ten years after selling her soul to Crowley.
Tommy Collins - Magically decapitated by Crowley.
Dale and Deb - Presumably beaten to death with a tire iron.
Len Fletcher - Killed by Marco on Crowley's orders.
Carl Granville - Killed by his hellhound ten years after selling his soul to Crowley.
Niveus security guard - Slit his throat while helping to capture Brady.
Noel's Guards - Telekinetically pointed their guns at each other and forced them to fire.
Marnie's husband - Presumably beaten to death with a tire iron.
Jenny Klein - Cooked in her own oven either through a hex or by one of Crowley's demons.
Louis - Exploded at the molecular level.
One of Plutus' guards - Threw the wooden stake that killed Plutus into his chest while possessing Linda Tran.
Channing Ngo - Telekinetically snapped her neck
Jenna Nickerson - Telekinetically slammed into the celling to save Dean.
Noel - Telekinetically snapped his neck.
An unnamed future prophet - Exploded at the molecular level.