Luigi Mangione, 26, was charged with second-degree murder and four related charges in the shooting death of UnitedHealthcare Chief Executive Brian Thompson in midtown Manhattan last week, a criminal complaint unsealed Tuesday revealed.
The complaint said police consider Mangione the key suspect based on "written admissions about the crime" and surveillance footage, reported The Washington Post.
Thompson, 50, was shot multiple times.
The felony arrest warrant lists the charges against Mangione as murder in the second degree; two counts of criminal possession of a weapon in the second degree; one count of criminal possession of a forged weapon in the second degree; and one count of criminal possession of a weapon in the third degree.
Mangione was to appear at a hearing at 1:30 p.m. Tuesday in Pennsylvania, which could lead to his extradition, reported NBC News.
A court ordered that Mangione transferred from a prison in Huntingdon, Pennsylvania, to the Blair County Prison in Hollidaysburg to await the execution of the New York arrest warrant, reported The New York Times.
In the complaint, Assistant District Attorney Joel Seidemann said he reviewed surveillance video of the exterior of the Hilton hotel where Thompson was killed Wednesday. The footage showed a man at about 6:44 a.m. wearing a "distinctive clothing outfit" approach Thompson from behind and point a firearm with a silencer attached before opening fire.
The complaint added that business records from a Manhattan hostel showed the suspect provided a New Jersey driver's license under the name of Mark Rosario, which a patrolman, Tyler Frye of the Altoona Police Department, reported that Mangione had in his possession during Monday's arrest at a McDonald's in Altoona, Pennsylvania.
Police also found a semiautomatic weapon with a 3D-printed loaded receiver and written admissions about the crime, the statement said.
Mangione was arrested in Altoona after a five-day manhunt.
He was arraigned in a nearby courthouse and was denied bail. He also faces five counts in Pennsylvania, including carrying a firearm without a license, possessing instruments of a crime, and providing law enforcement with false identification.
Investigators said Mangione had in his possession a three-page document that said in part that "these parasites had it coming," a senior law enforcement official briefed on the case told NBC News.
The official further said the document allegedly includes claimed that Mangione, the scion of a wealthy Maryland family, acted alone in killing Thompson.
In another line from the the document, Mangione also allegedly wrote, "I do apologize for any strife or traumas but it had to be done."
The note didn't specify UnitedHealthcare, but the broader healthcare industry in the United States. Officials said there are concerns that the writings could spur other acts of violence.
The complaint is one of the first that has been made public in the high-profile case and is expected to bring future court proceedings and a grand jury process leading to indictments on the same charges or other counts that could be similar.