Killed by Metatron

Beings killed by Metatron.

Cherubim

 * Trucker Cupid - Stabbed through the back with an angel blade to save Castiel's life.

Intelligence Angels

 * Naomi - Metatron stabbed Naomi in the back of the head with her own drill.

Regular Angels

 * Dozens of angels - Killed in the Fall of the Angels started by Metatron.
 * Azrael - Killed in the Fall of the Angels started by Metatron.
 * Ezekiel - Killed in the Fall of the Angels started by Metatron.
 * Sophia - Killed in the Fall of the Angels started by Metatron.
 * Constantine - Brainwashed into performing a suicide bombing.
 * Tyrus - Killed in Constantine's suicide bombing.
 * Ezra - Killed by Josiah on Metatron's orders.
 * Hannah's friends - Killed by Gadreel on Metatron's orders.
 * Josiah - Burned to death by a holy fire trap set by Metatron for Castiel.
 * Malachi - Killed by Gadreel on Metatron's orders.
 * Oren - Brainwashed into performing a suicide bombing.
 * Esther - Killed in Oren's suicide bombing.

Hunters

 * Dean Winchester - Stabbed through the chest with an angel blade; resurrected as a Knight of Hell by the power of the Mark of Cain.

Vessels

 * Naomi's vessel - Killed when Metatron killed Naomi.

Regular Humans

 * Six ice cream shop customers - Killed in the the suicide bombing conducted by Constantine on Metatron's orders after being brainwashed.