Joel Seidemann
Joel Seidemann is an Assistant Manhattan District Attorney involved in high-profile criminal cases, including the prosecution of Luigi Mangione, who is accused of murdering UnitedHealthcare CEO Brian Thompson. In recent court filings, Seidemann detailed the discovery of heart-shaped notes intended for Mangione during a hearing.
Not in the pool (under ¢1).
Recent news mentions
Assistant District Attorney Joel Seidemann sent a letter to Carro asking him to begin the New York trial on July 1.
Luigi Mangione speaks out in protest as judge sets state murder trial for June, ahead of federal trial
Canada· 2026-02-06
Assistant Manhattan DA Joel Seidemann wrote to the judge regarding the trial schedule for Luigi Mangione.
Luigi Mangione returns to court with federal death penalty motion pending
United States· 2026-01-30
Joel Seidemann was the prosecutor who questioned Detwiler about the arrest of Mangione.
Police were skeptical about tip that led to arrest of UnitedHealthcare CEO shooting suspect | Brian Thompson shooting
United Kingdom· 2025-12-03
Assistant District Attorney Joel Seidemann argued that the diary entries make Mangione’s intent unmistakable.
Luigi Mangione's diary unveiled: UnitedHealthcare CEO murder plot revealed in court; wrote ‘insurance checks every box’
India· 2025-06-05Joel Seidemann is an Assistant Manhattan District Attorney who wrote a court filing regarding the case.
Luigi Mangione received 'heart-shaped notes' hidden in socks before court: DAUnited States· 2025-03-28
