The CEO of UnitedHealth was fatally shot in the chest Wednesday morning outside the Hilton hotel in Midtown in what police say was a targeted attack. Brian Thompson, 50, was at the hotel at around 6:46 a.m. arriving early for a conference when a masked man allegedly waiting for him fired at the CEO repeatedly and fled eastbound off of 6th Avenue, police sources told The Post. Thomas was rushed to the Mt Sinai Hospital in critical condition, where he was later pronounced dead, police said.