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Luigi Mangione 's eyebrows were a dead giveaway he was the man wanted for gunning down a health care executive in cold blood ... at least according to folks who were eating at a McDonald's in Pennsylvania.

In a pretrial hearing Monday in New York, state prosecutors played the 911 call that led to Luigi's arrest at a Mickey D's in Altoona, Pennsylvania.

In the audio, the caller states there's a man in the McDonald's who other customers are suspicious of who "looks like the CEO shooter from New York."

The caller says this "suspicious" man is wearing a beanie and a blue medical mask, and the only distinguishing feature is his eyebrows.

Cops showed up, and Luigi was taken into custody .

We've seen photos of Luigi at the McDonald's, but we hadn't heard anything from

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