Attorneys representing Luigi Mangione are alleging that the federal government is presenting “barebones, vague allegations” in the death penalty proceedings against him, where he is accused of murdering the UnitedHealthcare CEO.

In a recent court motion, the defense has called for a federal judge to compel the prosecution to provide detailed information regarding the allegations they plan to substantiate during the sentencing phase of Mangione’s death penalty trial.

The defense argues that the prosecution’s information on various factors—such as potential threats to others besides the victim and the consequences for the victim’s family—”contain only barebones, vague allegations, lacking any information about the facts upon which the government intends to rely,” as stated in the filing.

Luigi Mangione shouts while officers restrain him as he arrives for his extradition hearing at Blair County Courthouse in Hollidaysburg, Pennsylvania, on Tuesday, Dec. 10, 2024. (David Dee Delgado for Fox News Digital)

The prosecution also points to journal entries and a note addressed to the FBI by Mangione, in which he allegedly rails against the U.S. healthcare system, adding that “these parasites simply had it coming.” 

Mangione faces several federal charges, including alleged murder through use of a firearm and stalking. Additionally, he is facing state charges in a case that is expected to proceed ahead of his federal trial. 

Mangione has pleaded not guilty to all charges. 

The Department of Justice and Mangione’s legal team did not immediately respond to Fox News Digital’s request for comment.