Gunman who killed Brian Thompson, UnitedHealthcare CEO, is on the loose. What we know about the suspect.

NEW YORK — A manhunt is underway in New York for the gunman who shot and killed UnitedHealthcare CEO Brian Thompson on Wednesday morning in what authorities said appeared to be a targeted attack.

Thompson, 50, was shot once in the back around 6:45 a.m. outside the Hilton Midtown hotel on Sixth Avenue near West 54th Street in New York City, officials said at a press conference Wednesday. Thompson was not a guest at the Hilton but was staying at another hotel nearby and walking to the Hilton for a corporate event when he was attacked.

The shooting happened ahead of an investors conference that UnitedHealth Group, the parent company of UnitedHealthcare, was scheduled to host on Wednesday at the Hilton, according to a spokesperson for the subsidiary.   

What we know about the suspect in CEO shooting

The suspect has not been identified. He is a light-skinned man and was wearing a grey colored backpack, which NYPD Chief of Detectives Joseph Kenny described as “very distinctive.” Kenny said the gunman was also wearing a light brown or cream colored jacket, black face mask and black-and-white sneakers.

The suspect appeared to be lying in wait for Thompson for several minutes, newly sworn-in Police Commissioner Jessica Tisch said during Wednesday’s news conference.

“Based on the evidence we have so far it does appear that the victim was specifically targeted, but we don’t know why,” Kenny said. 

The suspect approached Thompson from behind as he walked to the Hilton, then shot him at least once in the back and once in the right calf. Kenny said the suspect appeared to be proficient in the use of firearms, noting that the suspect appeared to quickly fix a jam in his weapon. 

The suspect first fled on foot before getting on an electronic CitiBike, Tisch said. He was last seen in Central Park. Police are attempting to track him through video canvass, Kenny said. CitiBikes do have GPS tracking, Kenny said, and the NYPD will work with the company for that information. 

What evidence have police found? 

Three live 9 millimeter rounds and three discharged 9 millimeter shell casings were recovered from the scene, Kenny said. Police also found a cellphone along the route the suspect used to flee the scene. Police are doing a forensic analysis of the device to determine if it belongs to the suspect, Kenny said. 

Police are still going through surveillance images and said they have video, but no audio, of the shooting. 

Investigators and security at UnitedHealthcare are combing through files searching for a possible motive, looking for possible previous threats, and disgruntled or recently fired workers, a law enforcement source said. Police are also looking at social media and interviewing employees, family members and others who knew Thompson, Kenny said. 

Ongoing manhunt will not disrupt holiday events 

NYPD Chief of Department Jeffrey Maddrey said that police will use all of the resources at their disposal, including drone and K-9 units, to find the suspect. People in Manhattan can expect to see a heavier-than-usual police presence in the borough, especially at Wednesday night’s Christmas Tree Lighting at Rockefeller Center, Maddrey said. 

“When an incident like this happens, we don’t spare any expense,” Maddrey said.  

Pat Milton and John Doyle contributed to this article.