Delay, Deny, Depose...,

cbsnews  |   Bullets that an unidentified gunman used to shoot and kill UnitedHealthcare CEO Brian Thompson on Wednesday morning had words written on them, CBS News has confirmed.

The words "delay," "deny" and possibly "depose" appeared on shell casings and bullets recovered from the scene of the shooting in New York City, according to New York City Police Department officials. Law enforcement officials said they are examining whether the words relate to a possible motive involving insurance companies and their responses to claims. ABC News first reported this information.

A source briefed on the investigation said each word was meticulously written, not etched, onto the casings in Sharpie. Officials are examining the casings to determine whether the words could be related to a possible motive involving insurance companies and their responses to claims. Investigators believe they could reference "the three D's of insurance" coined by the industry's critics, which are "delay," "deny" and "defend." The alliteration is a comment on the tactics that opponents say insurance companies use to delay or deny policyholders' claims.

Thompson, 50, was shot multiple times before 7 a.m. ET Wednesday, by a masked gunman who fled the area before police arrived. The shooting happened in a busy section of Manhattan outside of the Hilton Midtown hotel, where the executive was set to attend a conference for UnitedHealthcare investors. Thompson had been staying at the Marriott across the street, authorities said.

The NYPD released the first unmasked images Thursday of an individual wanted for questioning in connection with the shooting, asking the public for help identifying that individual. The images were taken from a hostel in the Manhattan Valley area of the Upper West Side. A law enforcement official with knowledge of the investigation told CBS News the man used a fake ID with a fake name to check into the hostel. A person briefed on the investigation said it was a fake New Jersey identification card. The hostel said in a statement to CBS News it was cooperating with the NYPD.