The first of six officers charged in a police custody death that sparked riots in Baltimore went on trial Wednesday as a prosecutor focused on what the patrolman failed to do: Push a button to call for a medic who might have saved Freddie Gray’s life.

Attorneys for Officer William Porter disputed this and other claims made in the trial’s opening statements, questioning how and when Gray’s neck was broken in the back of a police van, and whether the young black man was really in need of medical attention when he first asked for it.

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