Lester Holt on Luigi Mangione. Divorce attorney on trial for client's murder. Plus, ankle monitors.

This segment previews a special Dateline investigation into the high-profile murder of UnitedHealthcare CEO Brian Thompson in New York City. Host Lester Holt joins to discuss the arrest of suspect Luigi Mangione in Pennsylvania and the public reaction surrounding the case.

Lester Holt discusses the rapid investigation into the shooting of UnitedHealthcare CEO Brian Thompson. He details how investigators tracked suspect Luigi Mangione using Manhattan's security cameras and discusses Mangione's background and manifesto.

Lester Holt and Andrea Canning discuss the challenges of seating a jury in New York for a high-profile murder trial. The segment then transitions to the 2013 cold case of Aliza Sherman, whose divorce attorney Gregory Moore was recently indicted for her murder.

Andrea Canning and Lynn Singer discuss the 2013 murder of Aliza Sherman, a Cleveland IVF nurse who was killed while going through a contentious divorce. Her attorney, Gregory Moore, was arrested years later and charged with her murder, with prosecutors alleging he killed her to avoid going to trial.

Andrea Canning and guests discuss legal updates, including a delayed trial involving a messy divorce and the murder of Aliza. They also preview the Dateline Roundup, highlighting the conviction of Ian Mitcham for the 2015 murder of Allison Feldman in Maricopa County, Arizona.

The penalty phase of Ian Mitcham's murder trial ends in a mistrial, leaving prosecutors to decide between pursuing the death penalty again or accepting life in prison. Meanwhile, in San Diego County, the trial of Larry Millete continues with testimony from investigators and family members regarding the disappearance of his wife, Maya Millete.

Andrea Canning explores the effectiveness and limitations of ankle monitors, highlighting high-profile cases in Texas where murder suspects cut off their devices and fled. Corrections technology expert Joseph Russo explains how these systems function, their design vulnerabilities, and the systemic resource shortages that hinder real-time response.

Corrections expert George Drake explains the difficulties of enforcing GPS and electronic monitoring within the criminal justice system, warning that a lack of rapid response resources leads to failure. Host Andrea Canning concludes the interview, highlighting the need for accountability to prevent tragic outcomes.