The GiveSendGo defense fund for the 26-year-old Mangione was established by an anonymous group calling itself "The December 4th Legal Committee," apparently in reference to the day Mangione allegedly ambushed and gunned down Thompson in Midtown Manhattan as the executive walked to his company's shareholders conference at the New York Hilton hotel.

Luigi Mangione, the man charged with murder in the death of UnitedHealthcare executive Brian Thompson, has retained a top New York attorney who previously worked in the same office pursuing the case against Mangione.

Luigi Mangione might waive extradition to New York to face charges in the killing of UnitedHealthcare CEO Brian Thompson, the Manhattan DA says.