He killed a high-profile CEO on a sidewalk in America’s largest city, where thousands of surveillance cameras monitor millions of people every day.

But the man who killed UnitedHealthcare CEO Brian Thompson outside a busy hotel keeps evading capture. Now, authorities say he might have slipped out of New York – meaning the elusive gunman could be anywhere.

Aren’t there cameras everywhere in New York City?

It could take weeks to find and scrub through a massive array of video footage from all the places where the gunman may have traveled.

Police believe the suspect arrived in New York City 10 days before the killing – on November 24, a law enforcement official told CNN. Throughout his stay, the suspect appeared on camera numerous times – but always kept his hood over his head and wore a mask in public places.