The significant injuries inflicted by the unidentified teenager during the brutal attack ultimately led to the animal being euthanized by animal control officials, the New York Daily News said Sunday.

The attack began Thursday shortly after the animal was spotted on top of a Staten Island restaurant. Witnesses said the blond-haired teen climbed onto the building's roof, choked the bird and threw it to the ground where he began violently stomping on it while screaming "I'm killing a vampire!"

Felicia Finnegan, a 19-year-old who witnessed the entire event, said the bird had done nothing wrong and was even trying to flee during most of the attack.

"It was very demented, the whole thing. He was kicking it like crazy. It was just trying to get away," she told the Daily News. "I didn't think any normal person could do something like that."