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What we know about CEO shooting suspect

Police said they arrested a 26-year-old on firearms charges in connection to the New York killing.

He is also a graduate of the University of Pennsylvania, where he received a bachelor's and master's degree in computer science, according to the school, and founded a video game development club. Mr Mangione was in possession of a so-called ghost gun, a largely untraceable firearm that can be assembled at home using kits, that was likely manufactured on a 3D printer, according to police officials. A person matching his name and photo had an account on Goodreads, a user-generated book review site, where he gave four stars to a text called Industrial Society and Its Future by Theodore Kaczynski – more popularly known as the Unabomber manifesto.

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