Prosecutors in New York City have raised concerns about Luigi Mangione, accused of murdering UnitedHealthcare CEO Brian Thompson, after discovering heart-shaped notes expressing public support for him inside a pair of socks provided by his defense team. The Manhattan District Attorney's Office is worried about the potential influence of these messages on the legal proceedings and has also opposed Mangione's access to a laptop while in prison. These developments add complexity to the ongoing legal discussions as the case progresses, with charges of murder and terrorism against Mangione.