WATCH: Suspect in the killing of UnitedHealthcares CEO struggles, shouts while entering courthouse [Video]

ALTOONA, Pa. – The man accused of killing UnitedHealthcare’s CEO struggled with deputies and shouted while being led into court Tuesday as new details emerged about his possible motivation behind the ambush.

In his first public words since a five-day search ended with his arrest at a McDonald’s in Pennsylvania, Luigi Nicholas Mangione emerged from a patrol car shouting about an “insult to the intelligence of the American people” while deputies pushed him inside a courthouse.

The 26-year-old Ivy League graduate from a prominent Maryland real estate family is fighting attempts to extradite him to New York so that he can face a murder charge in the Manhattan killing of Brian Thompson, who led the United States’ largest medical insurance company.

A law enforcement bulletin obtained by The Associated Press said that at the time of his arrest, Mangione was carrying a handwritten document expressing anger with what he called “parasitic” health insurance companies and a disdain for corporate …