The father of a student killed during the Parkland, Fla., school shooting has filed a wrongful death lawsuit against the school resource officer who stayed outside during the attack.

Andrew Pollack, whose 18-year-old daughter Meadow Pollack died in the shooting, announced on Monday that he is bringing the suit against former Broward County sheriff’s deputy Scot Peterson. 

“I filed a wrongful death suit against Deputy Peterson today,” Pollack tweeted. “I want to expose that coward so bad. 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!”

“This suit has nothing to do with money,” Pollack added.

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Peterson resigned in February after he was criticized for not entering the building during the shooting, despite being the armed resource officer stationed at Marjory Stoneman Douglas High School.

Sheriff Scott Israel ripped Peterson for failing to confront the assailant who used an AR-15 to kill 17 people and injure dozens of others.

A 27-minute surveillance video released by officials appears to show Peterson outside the building.

Israel said the video made him “sick to [his] stomach” and left him feeling “devastated.”

“There are no words,” he said.

Pollack has been pushing for stricter school safety regulations following the shooting.

While speaking to President TrumpDonald John TrumpWarren defends, Buttigieg attacks in debate that shrank the field Five takeaways from the Democratic debate in Ohio Democrats debate in Ohio: Who came out on top? MORE during a listening session on school safety, Pollack said he was "pissed” about what had happened.

"It stops here with this administration and me," he said. "It should have been one school shooting and we should have fixed it. I'm pissed. Because my daughter, I'm not going to see again. She’s not here. ... It’s enough. Let’s get together, work with the president and fix the schools."

“We must have proper security in every school in America!” He tweeted last month.