UnitedHealth

Police say the suspect had a ghost gun, possibly made with a 3D printer, when he was arrested on Monday. Here's what to know about the increasingly widespread weapons and efforts to regulate them.

Manhattan prosecutors Monday night filed murder and other charges against Luigi Mangione, 26, in the killing of UnitedHealthcare's CEO last week, according to online court documents.

Shell casings with the cryptic words "deny," "defend" and "depose" were found at the scene of the fatal shooting of the UnitedHealthcare CEO outside of a Manhattan hotel, police officials say.

Thompson, a 50-year-old father of two, spent two decades at UnitedHealth Group before his shocking death. Tributes are pouring in from coworkers and public officials in his home state of Minnesota.

The federal government overpaid for nearly half of the patients of a Medicare Advantage plan, a Medicare audit found. At issue is whether insurers "upcode" diagnoses to reap bigger payments.