The U.S. government denied “eavesdropping” on UnitedHealthcare CEO murder suspect Luigi Mangione’s recorded jailhouse calls in a Monday court filing after his defense attorneys claimed federal officials shared his calls with the New York County Attorney’s Office (DANY).

Mangione’s New York-based defense attorney, Karen Friedman Agnifilo, said during Mangione’s Friday arraignment that one of his jailhouse calls with her was recorded and “eavesdropped on” by a member of the DANY’s team, noting that the DANY office informed her that one person listened to the call. 

“To be sure, no one at DANY or the Government ‘eavesdropped’ on the defendant on a live basis,” federal prosecutors wrote. “Rather, consistent with well-known practice in federal and state jails, many of the defendant’s calls are recorded, with notice of the recording provided to him and the person on the other side of any calls.”

Prosecutors added that “a number of calls” between Mangione and Friedman Agnifilo “were provided by the Metropolitan Detention Center (‘MDC’) to the Government – and by the Government to DANY – because the defendant spoke to his counsel on a recorded and monitored jail line (not a line specially designated for attorney calls) and with counsel using a telephone number that was not identified as belonging to counsel (thus evading MDC’s process for filtering attorney calls before providing them to the Government).”

The suspect allegedly shot Thompson outside the Manhattan hotel where UnitedHealthcare’s annual shareholder conference was being held, in an act prosecutors believe was meant to send a message to the healthcare insurance industry based on a manifesto found on the suspect when he was arrested days after Thompson’s murder.

Luigi Mangione departs the courtroom following his arraignment in New York City Criminal Court on Dec. 23, 2024. (Rashid Umar Abbasi for Fox News Digital)

If the 26-year-old is convicted of murder through the use of a firearm, Mangione could face the death penalty, as federal prosecutors have indicated in court filings.

Fox News’ Adam Sabes contributed to this report.