CNN
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As the investigation into the fatal shooting of a health care executive in Manhattan enters its fourth day, police are piecing together clues, including a backpack, photos, video, ammunition, DNA and more, to help zero in on a suspect they believe is no longer in the city.
Investigators appear to be homing in on the possible identity of the suspect, two people briefed on the investigation said, but are still working to verify the information and are not yet certain they know his identity.
“This isn’t ‘Blue Bloods.’ We’re not going to solve this in 60 minutes. We’re painstakingly going through every bit of evidence that we can come across,” Joseph Kenny, the chief detective of the NYPD, told reporters Friday.
At least two key pieces of evidence continued to evade investigators Saturday morning, including an electric bike the suspect rode and the gun used in the killing.
Authorities have yet to officially confirm the bag’s origins, the source said.
Investigators are also examining whether the shooter used a specialized weapon in the killing, Kenny told reporters Friday.
In an investigation involving the NYPD, the FBI and the Atlanta Police Department, the manhunt has expanded beyond New York City as officials seek the public’s help in identifying the man pictured unmasked in surveillance images released Thursday authorities say offer a significant clue in the search. Officials are in the process of ruling out a tip that the shooter left the area by plane.
The suspect traveled to New York City on a Greyhound bus that began its route in Atlanta, Kenny said Friday. Upon his arrival on November 24, the suspect took a cab from the Port Authority bus terminal to the vicinity of the Hilton Hotel and stayed there for about half an hour, he said.
Investigators say the suspect then used a fake New Jersey driver’s license to check into an Upper West Side hostel which has since notified its guests it is cooperating with the police investigation.
Photos from the hostel along with a burner phone and water bottle believed to have been dropped by the suspect upon fleeing the Wednesday shooting scene outside the Hilton Midtown have offered investigators additional clues in the case.
Kenny told reporters the words “delay,” “deny” and “depose” were scrawled on the ammunition, one word on each of three bullets. The bullets are still being tested, he said.
Police are exploring whether the words could indicate a motive, since they are similar to a phrase commonly used to describe insurance company tactics: “Delay, deny, defend.” The phrase is also the title of a book critical of the industry.
“It could possibly be a disgruntled employee or a disgruntled client,” Kenny said Friday when asked about the words on the bullets.
UnitedHealth Group, the parent company of Minnesota-based UnitedHealthcare, has mapped out security plans for employees in the wake of the attack.
NYPD investigators appear to be getting closer to a possible identification of the suspected shooter, two people briefed on the investigation said late Friday.
Investigators are working to track the suspect’s potential whereabouts with the help of thousands of investigative leads, including traces of DNA which could help find the killer, the people briefed on the probe said.
Investigators are still working to verify the information as of Saturday.
Some techniques have led to dead ends, with detectives unable to use facial recognition on the unmasked hostel photos to identify the shooter – possibly because of the angle of images or restrictions of the database, Kenny told reporters Friday. A fingerprint previously obtained by police was unusable for an identification, he said, adding it could be enhanced later in the investigation. Bus manifests likewise may not be helpful since identification is not required to board, according to Kenny.
Police have been able to use surveillance video to track the shooter’s movements after he arrived in New York City on November 24 and for a short time directly after the December 4 shooting. Investigators are processing video from the Port Authority in hopes of finding out what bus he got on if he did board one.
They have also contacted UnitedHealthcare’s security team to obtain its own person-of-interest list, looking for people who have been publicly vocal with complaints against the company, according to the source.
There’s no indication, however, that the shooter and CEO had any prior interactions or that the shooting was related to Thompson’s personal life, Kenny said in the Friday news briefing.
Police are asking about anyone who has used any vitriolic language and made threats, either on social media or through attendance at public demonstrations.
“As we’re going through our investigation, we’re coming across a lot of online comments, a lot of online threats, things of that nature. His wife indicated that he had received some prior threats,” Kenny said.
The law enforcement source said most people on the list have been already been dismissed by using social media searches. The rest are being looked into for any possible ties.
The mandate is to continue to build a video timeline of every day the suspect was in the city, the source said.
Identifying the suspect is critical and multiple law enforcement agencies are offering to help in the search once an identification is made, the source added.
The backpack was removed by an excavator along with any physical material found surrounding it, the source said. No officers picked it up, because there may be some DNA evidence tied to the backpack or even the dirt on the ground surrounding it.
“This is one of these things where even touching it or going through it with rubber gloves, you can smudge prints, move DNA, contaminate it with your own material,” Miller said.
“When they go to trial, they want to be able to testify this was all done with perfect procedure in terms of trying to preserve that evidence and then extract that evidence,” he added.
Forensic investigators at a police lab in Queens will go through the contents of the bag slowly and deliberately, examining not only the contents but the bag itself, which may contain sweat or other evidence connecting to the shooter, the source said.
Investigators are also looking into the possibility the gunman who killed Thompson may have used what is known as a veterinary gun, a larger firearm used on farms and ranches to put down animals without causing a loud noise, Kenny, the chief detective of the NYPD, said Friday.
The veterinary gun is based on the design of a British-made Welrod pistol, dating back to World War II, was an assassin’s weapon, Miller explained.
“It’s practically silent. It’s a significant round. It’s a 9 millimeter round. And it’s meant for close-up killing. It’s meant for vets to kill an animal by shooting it in the head or somewhere, you know, that’s going to be fatal. But it would work the exact same way on humans, very effectively and extraordinarily quietly,” Miller said.
