Thompson did not travel with any personal security detail despite known threats against him.
"There had been some threats," Thompson's wife, Paulette Thompson, told NBC News on Wednesday.
"Basically, I don't know, a lack of coverage?
I don't know details.
Two of UnitedHealthcare's peers, Humana and Cigna, both said in their most recent proxy statements that they provide personal security to executives.
Persons:
United Healthcare Brian Thompson, Brian Thompson, Jessica Tisch, Thompson, Paulette Thompson, Joseph Kenny, Kenny, Rob D'Amico, D'Amico, UnitedHealthcare's
Organizations:
United Healthcare, New York, NBC, New, New York Hilton, Wednesday, Police, ABC News, NBC News, FBI, UnitedHealth, Cigna, SEC, CVS Health
Locations:
Midtown Manhattan, New York City, US, New York, New York Hilton Midtown, Sixth, Manhattan, Mount Sinai