The man who killed four people at a Manhattan office building bought his AR-15-style rifle and getaway car from his Las Vegas boss, NYPD officials said, as funerals for victims begin across New York.

Investigators discovered a second note at the Las Vegas home of the gunman who killed four people in midtown Manhattan, officials said. The note mirrors the one found on his body in New York, where he blamed football for his mental illness as authorities examine his brain for signs of CTE.