Stepping out of the Port Authority bus terminal late in the evening on Nov. 24, authorities say, Luigi Mangione took a taxi to the New York Hilton Midtown, where UnitedHealth Group Inc. planned its annual investor conference 10 days later.

There were no outbursts like his first appearance at Blair County Courthouse in Hollidaysburg, Pennsylvania, when he yelled at reporters before entering the building. Mangione, a 26-year-old