First responders tried to perform CPR to save the UnitedHealthcare CEO who was fatally shot outside a Midtown hotel on Wednesday morning, harrowing video shows.NYPD officers were seen in front of the Hilton Hotel, on 6th Avenue, performing chest compressions on Brian Thompson, 50, who was shot repeatedly upon arriving at the hotel at around 6:46 a.m.to attend a conference, Fox 5 video shows....