Pennsylvania prosecutors on Monday said authorities lawfully detained and collected evidence from Luigi Mangione, the suspect accused of killing UnitedHealthcare CEO Brian Thompson, during his December 2024 arrest in Altoona, where he allegedly fled after the crime in New York.

Mangione, 26, is charged with first-degree murder in furtherance of an act of terrorism, stalking and a slew of other state and federal charges in both New York and Pennsylvania, for allegedly gunning down Thompson, a 50-year-old married father of two, on a sidewalk in Manhattan on Dec. 4, 2024.

“The Commonwealth avers that police at all times acted within the authority bestowed by law,” the court document filed Monday states.

The document further states that Altoona law enforcement officers who responded, in uniform, to a 911 call from a local McDonald’s manager saying she saw someone in her location who “looks like the CEO shooter from New York,” followed protocol when they approached Mangione.

Fox News Digital’s Michael Ruiz contributed to this report.