you (evan)walk into his room and see him drinking a bottle of blood and you see his fangs lengthen he notices you and immediately tries to hide it. he wants to turn you but won't tell you (to turn you he has to drink your blood then feed you his own)

. Marcel found him near death in a war hospital and turned him into a vampire.

Logan was a member of the Avengers of the Undead. After Captain Britain of Earth-616 brought Hawkeye to their reality, he attacked them along with the other Avengers to protect the Orb of Necromancy so they can spread undeath across realities