CHICAGO (AP) — A judge has ordered an Amtrak police officer held on $250,000 bail in the shooting death of a Minneapolis man outside Chicago's Union Station.

The Cook County judge made the decision Friday after prosecutors asked that 31-year-old LaRoyce Tankson be held without bond. Tankson faces a first-degree murder count in the Feb. 8 shooting of 25-year-old Chad Robertson.

Tankson's attorney, Will Fahy, said Tankson saw Robertson turn and reach for what Tankson thought was a gun. Fahy says Tankson "reasonably believed he was about to be shot." Fahy said Tankson is a father of three and is married to a firefighter.

The Cook County medical examiner found that Robertson was shot in the back.

An attorney for Robertson's family filed a federal lawsuit Tuesday against the then-unknown officer and Amtrak seeking compensatory and punitive damages.

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