Luigi Mangione Linked to Blackstone Killer in Death Penalty Memo

Luigi Mangione deserves the death penalty in part because he’s sought to inspire more vigilante violence, the Justice Department argued to a federal judge while suggesting the recent mass shooting in Manhattan is an example of the alleged assassin’s impact.

Since Mangione’s alleged murder of a UnitedHealth Group Inc. executive, “certain quarters of the public—who openly identify as acolytes of the defendant—have increasingly begun to view violence as an acceptable, or even necessary substitute for reasoned political disagreement,” prosecutors wrote in a court filing on Wednesday.

Like Mangione, Manhattan shooter Shane Tamura “left behind a piece of evidence for investigators to find, blaming the NFL and football for causing chronic traumatic encephalopathy,” prosecutors said. Tamura is the shooter who killed four people and himself in July at the offices of Blackstone and the NFL.

“Almost immediately, members of the public sympathetic to the defendant touted Tamura’s actions as a laudable continuation of the defendant’s philosophy,” they said.

Prosecutors drew the link in opposing Mangione’s request for more details on what the government would argue at a potential capital sentencing phase of his trial. Mangione argued in July that he’s entitled to “an informational outline” on the requisite “aggravating factors” the government would seek to prove to justify the death penalty.

The Justice Department said Mangione has that information already through the government’s court filings and discovery, and that more information would be premature.

But it also argued Mangione’s “future dangerousness” is one such factor justifying the death penalty that’s already been made clear by the evidence.

Brian Thompson’s murder was “calculated to resonate beyond this specific victim and to generate scorn, outrage, or fear toward the health insurance sector more broadly,” prosecutors wrote. “Simply put, the defendant hoped to normalize the use of violence to achieve ideological or political objectives.”

Mangione is represented by Agnifilo Intrater.

The case is United States v. Mangione, S.D.N.Y., No. 1:25-cr-00176, memo in opposition 8/27/25.