Dalton St. John was a character on The Vampire Diaries. He made his debut in twentieth episode of the seventh season. He was a member of The Armory and the brother of the founder of the organization. He is the great-grandfather of Alexandria, Yvette and Virginia, and the uncle of Lorenzo. After opening the door to the vault, he becomes affected by the monster and kills his colleagues.
Throughout The Vampire Diaries Series
In Kill 'Em All, according to Virginia's story, he entered the opened vault with other members of the Armory. After hearing voices, the darkness snuffed out all of the light from their candles, as Dalton screamed. They brought him out and sealed the vault again. Immediately, Dalton was changed by his encounter with whatever creature of darkness is trapped in the vault. He was stripped of all empathy and love, leaving him a smiling and whistling psychopath, having murdered all his Armory subordinates with a smile.
Dalton was a young man standing at what seems to be 5'8, with bright blue eyes and short brown hair.
- Kill 'Em All (Flashback)
- Dalton is an English name and it means "the settlement in the valley". 
- St. John is Hebrew and means "Jehovah has been gracious; has shown favor". In the bible John the Baptist baptized Christ in the Jordan river. It can also mean "the grace or mercy of the Lord".
- According to his sides in 1892, he is involved in a scene with his friend and a mysterious woman inside of a cave.
- With confirmation that human souls are found in the dimensions, he either found peace or went to Hell.