"I'm sorry," Mangione told the police officer before looking down at his phone. Mangione identified himself as "Mark Rosario" during the interaction and handed over an ID.
According to the officer, the person who reported Mangione to authorities did so because they "thought [he] looked like someone."
Earlier in the week, prosecutors released several pictures depicting Mangione's possessions, such as his ID, credit and debit cards, an escape route from Pittsburgh to Cincinnati and more.
Last week, prosecutors released the 911 call which led to Mangione's arrest at the Pennsylvania McDonald's.
"I'm a manager at Plank Road McDonald's out here on the boulevard," a McDonald's manager told the 911 dispatcher. "And I have a customer here, that some other customers were suspicious of, that he looks like the CEO shooter from New York."
Altoona Police Officer Stephen Fox testified that he was confident Mangione was the suspect in Thompson's death when the alleged assassin smiled at him.
Mangione faces numerous state and federal charges in relation to the alleged murder.
Fox News Digital's Michael Ruiz contributed to this report.