Ghost guns, like the weapon the NYPD said UnitedHealthcare shooting suspect Luigi Mangione had when arrested, can be assembled at home.

The 26-year-old suspect arrested for killing United Healthcare’s CEO may have used a 3D-printed gun to carry out the shooting, according to investigators. The suspect, Luigi Mangione, was arrested in Altoona,

The post criticizes people "cheering for the gunman" who shot and killed UnitedHealthcare CEO Brian Thompson on Dec. 4 outside a New York City hotel. Start the day smarter. Get al

Homemade weapons like the one that police believe suspect Luigi Mangione used are increasingly common, prompting more efforts to regulate them.

Luigi Mangione was arrested in the killing of CEO Brian Thompson Monday. Here's what we know about the 26-year-old shooting suspect.

Luigi Mangione, the suspect in United Healthcare CEO Brian Thompson's killing, is now awaiting extradition to New York City.

Luigi Mangione, the suspect in the fatal shooting of UnitedHealthcare CEO Brian Thompson, was found carrying a “ghost gun” at the time of his arrest, according to police. CNN’s Josh Campbell explains what ghost guns are and why they’re nearly undetectable to law enforcement.

Various merchandise is being sold online glorifying the UnitedHealthcare CEO shooting suspect, Luigi Mangione. Ornaments, bracelets and T-shirts are among some of the products for sale. NBC News’ Valeri Castro details what some companies are saying about the items listed.

The 26-year-old charged with murder in the killing of a UnitedHealth executive in New York was captured in Pennsylvania with a backpack police said contained a so-called "ghost gun."