Luigi Mangione, the man accused of fatally shooting UnitedHealth CEO Brian Thompson outside a Manhattan hotel last year, returns to New York state court Monday for the start of a complex pretrial hearing that could shape how the prosecution unfolds.

Mangione, 27, has pleaded not guilty to nine state counts, as well as four federal charges filed separately. The federal charges come with the possibility of the death penalty .

The hearing could last at least a week. Marc Agnifilo, one of Mangione’s attorneys, said he expects prosecutors to call as many as 28 witnesses — including some from Altoona, Pennsylvania, where Mangione was apprehended last December at a McDonald’s restaurant days after the shooting.

The proceedings are set to be divided into two sections. Both will focus on whe

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