NEW YORK -- A police officer who responded last Dec. 9 to a McDonald's where witnesses said they may have spotted the man accused of killing a health care CEO testified Tuesday that he knew right away it was the suspect.

"I knew it was him immediately," Altoona, Pennsylvania, police officer Joseph Detwiler testified about Luigi Mangione , who is accused of killing United Healthcare CEO Brian Thompson in New York City last year.

Mangione, 27, is in court Tuesday for the second day of a high-stakes hearing in his state criminal case, where his lawyers are fighting to bar prosecutors from using key evidence against him -- including the alleged murder weapon and writings that prosecutors say amount to a confession -- by arguing it was unlawfully seized when his backpack was searched witho

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