Retired officer Scot Peterson, 60, has maintained his innocence and said he didn't enter the building because he didn't know where the shots were coming from

Jurors heard opening statements in the trial of Scot Peterson, the ex-school resource officer who did not confront the Parkland mass shooter.

Opening statements are underway in the trial of a former Florida sheriff's deputy charged with failing to stop the Parkland school massacre five years ago

The trial of Scot Peterson began Wednesday, as jurors heard opening statements about whether the former school resource officer reacted appropriately when he remained outside a Parkland, Florida, high school while 17 people were gunned down five years ago.