Authorities are looking into online accounts believed to be those of Luigi Mangione, the 26-year-old Ivy League graduate ...

Instead of being able to calmly focus on her chemotherapy treatment, Arete Tsoukalas had to spend hours on the phone arguing with her insurer while receiving infusions in the hospital.

The ghost gun allegedly in Luigi Mangione's possession when he was arrested has been matched to three shell casings recovered ...

He could not confirm how he came to represent Mangione, he would only say he was retained Tuesday ahead of the suspect's extradition hearing in Pennsylvania.

Mangione has been charged with murder for the killing of UnitedHealthcare CEO Brian Thompson, a father of two, in a brazen shooting on Dec. 4 outside a Manhattan hotel before an industry conference, ...