A security guard at a St. Paul nightclub has been charged with first-degree assault after he allegedly punched a customer early Sunday morning, causing the man to fall and hit his head, inflicting grave injuries.

Jose Eucario Conejo Marquez, 28, of North St. Paul, was charged Monday in Ramsey County District Court.

The criminal complaint said the customer, a 33-year-old man, is on life support and not expected to survive.

The complaint gave the following details about the weekend incident at the North End nightclub:

The 33-year-old customer, who was on a first date at the Blues Saloon at 1638 Rice St., reportedly became jealous after multiple men made advances on his date. He became upset and was asked to leave the club.

Surveillance video showed that after the man was in the parking

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