The New York City Police Department on Thursday released photos of a person sought in connection with the deadly Manhattan shooting of UnitedHealthcare CEO Brian Thompson, following requests for the public’s help as they scrambled to gather evidence that might lead to the killer. The NYPD has advised that the murder wasn’t random but appeared to target Thompson, who led a giant health care provider employing more than 400,000 people and insuring millions of members.

We don’t yet know what motivated the midtown murderer, who is now the subject of a manhunt. We do know that something went horribly wrong as Thompson walked across the street to attend his company’s investor meeting.

With those types of numbers, the number of potential suspects is enormous, even if we do have a photograph of a person of interest.