Editor's note: The video above aired on Dec. 10, 2024. MIDTOWN, Manhattan (WPIX) – Fingerprints taken from Luigi Mangione in Pennsylvania matched those on a water bottle found near the scene of UnitedHealthcare CEO Brian Thompson's fatal shooting, sources told Nexstar's WPIX on Wednesday. The water bottle and a cell phone were found in the alleyway where Mangione allegedly fled after Thompson was shot in front of a New York City hotel last week, sources said. Mangione was arrested in Altoona, Pennsylvania, on Monday after he was spotted by a customer in a McDonald's, according to authorities. He had a fake ID on him that matched one used at a Manhattan hostel prior to the shooting, police said. Who was Brian Thompson, the UnitedHealthcare CEO? Mangione appeared in a Pennsylvania court on Tuesday, where he contested his extradition back to New York to face murder and other charges. “This is completely out of touch and an insult to the intelligence of the American people,” he said as he was led into court. His lawyer, Thomas Dickey, told NewsNation on Tuesday that he believed his client was entitled to bail under Pennsylvania law. “I don’t want people to jump to these pre-judgment things because nobody would ever want that if they were accused, or one of their loved ones were accused,” Dickey said. “And the big hearing today, I haven’t seen any evidence yet. I don’t even know if this is him or whatever. So we’re going to test those waters and give the government a chance to bring some evidence.” Family of Luigi Mangione speaks out following arrest and arraignment The NYPD is putting together a timeline of Mangione's movements before, during, and after Thompson was shot and killed. A handwritten manifesto was found on him at the time of his arrest, police said. It read in part, “Frankly, these parasites had it coming. I do apologize for any strife or traumas but it had to be done. I wasn’t working with anyone,” sources told WPIX. Investigators also recovered a spiral notebook that Mangione described in the manifesto, a law enforcement official told The Associated Press. He reportedly wrote that the noebook would contain clues about the attack. ‘Seemed unimaginable’: Luigi Mangione’s old roommate reacts to arrest “The spiral notebook, if present, has some straggling notes and To Do lists that illuminate the gist of it,” Mangione wrote, according to the official. Mangione plans to plead not guilty to the charges against him, Dickey said. The Associated Press contributed to this report.