A Florida judge on Wednesday rejected a former officer's argument that he had "no legal duty" to intervene during the Parkland school shooting that left 17 dead in February, according to the South Florida Sun-Sentinel.

Scot Peterson, who was the only armed deputy stationed at Marjory Stoneman Douglas High School the day of the shooting, asked Broward Circuit Judge Patti Englander Henning to dismiss a lawsuit brought against him by the family of a student killed during the shooting.

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“We want to say he had an obligation, but the law isn’t that. From a legal standpoint, there was no duty," said Peterson’s lawyer, Michael Piper, according to the Sun-Sentinel.

But Englander Henning ruled that Peterson had an “obligation to act reasonably” during the shooting

Peterson resigned from his job at the Broward County Sheriff's Office in February amid backlash for not intervening during the mass shooting.

Andrew Pollack, whose daughter Meadow Pollack was killed during the shooting, in April filed the wrongful death lawsuit against Peterson.

“I want to expose that coward so bad," Pollack wrote on Twitter at the time. "Where ever he goes I want people to recognize him and say that’s one of the cowards of Broward. The [school resource officer] that let those children and teachers die on the 3rd floor!”

Pollack on Wednesday told the Sun-Sentinel that his lawsuit is "about accountability" for his daughter and the other 16 victims, adding that Peterson "failed" to protect the victims.

“I just want to look that guy in the eye,” Pollack said. “It’s about accountability for the 17 victims and my daughter. He had a duty to go in there and protect and save my daughter. And he failed everybody that day."