NYPD believes UnitedHealthcare CEO assassin left New York City on a bus morning of shooting

NEW YORK – The masked gunman wanted in connection with the ambush shooting death of UnitedHealthcare CEO Brian Thompson Wednesday morning fled the crime scene using various modes of transportation before police believe he got on a bus out of the Big Apple, authorities told Fox News. Police traced his route from the crime scene near 54th Street and Sixth Avenue up to Central Park, which he exited at 77th Street and Central Park West, Chief of Detectives Joseph Kenny told Fox News Friday. Kenny's boss, new NYPD Commissioner Jessica Tisch, added that investigators have picked up an abundance of video and digital evidence in addition to physical evidence they hope can lead them to the killer. "We actually have a tremendous amount of forensic evidence in this case that we've collected- DNA evidence, fingerprint evidence, which is all at the lab now being processed," she told Fox News Friday. This undated photo provided by UnitedHealth Group shows UnitedHealthcare chief executive officer Brian Thompson.