In a federal case, Luigi Mangione's defense team has been in talks regarding a potential plea deal. According to sources familiar with the matter, these discussions have taken place, although the outcome is not certain. The sources indicate that the negotiations have stopped, but it is unclear how close the parties came to reaching an agreement.

Further details about the case and the plea deal discussions are available from ABC News. For more information on the federal case and the status of the plea deal negotiations, readers can refer to the original report from ABC News.