An Altoona, Pennsylvania, police officer testified on Tuesday that he walked into a local McDonald’s last December, skeptical of a tipster’s 911 call that the suspect wanted in the brazen murder of a UnitedHealthcare CEO on a Manhattan street was quietly eating his breakfast inside.

But after asking the man who was about to chow down on a hash brown and a steak and egg McMuffin to lower his mask, Patrolman Joseph Detwiler said all doubt was removed.

"I knew it was him immediately," he told the court during the second day of suppression hearings in the murder case against Ivy League graduate Luigi Mangione.

Prosecutors charge he killed health executive Brian Thompson , 50, to protest the high cost of medical bills.

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The Altoona, Pennsylvania police officer who arr

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