Fred Guttenberg, who lost his daughter Jamie in the 2018 school mass shooting, speaks with ABC News' Rachel Scott about his push for more gun control.

Seventeen students and staff were killed in the February 2018 Stoneman Douglas massacre.

Six Members of Congress visited Parkland, Florida, on Monday to tour the site of the Marjory Stoneman Douglas High School mass shooting.

Manny Oliver, who lost his son Joaquin to the 2018 mass shooting, spoke with ABC News Live.

The Parkland, Florida, high school massacre will be reenacted in the same building on Friday as a part of a lawsuit.

Families of the Parkland victims are now allowed to visit the 1200 building where students and staff were killed at Marjory Stoneman Douglas High School.

Scot Peterson, the ex-Parkland resource officer accused of allegedly failing to confront the school shooter, has been found not guilty.

Jury selection is set to begin Wednesday in the trial of Scot Peterson, a former school resource officer charged in connection with the Parkland school shooting.

The parents of Parkland victim Joaquin Oliver are bringing their new "children's book" to Washington, D.C., lawmakers in an effort to shine a light on gun control.

Manuel Oliver and his wife, Patricia Oliver, were removed from a House subcommittee hearing by Capitol Police officers at the direction of Chairman Pat Fallon

With the threat of gun violence on their minds, teachers are struggling with how to protect their students while worrying about their own safety.

The fate of confessed Parkland shooter Nikolas Cruz will soon be in the hands of the jurors.

Confessed Parkland school shooter Nikolas Cruz's attorney gave her opening statement to the jury on Monday.

Families of Parkland victims are addressing the court Monday during the penalty phase of the confessed shooter's trial.

A jury will determine the fate of confessed Parkland school shooter Nikolas Cruz.

The shooting at Robb Elementary School in Uvalde, Texas, left at least 19 children and two teachers dead.

Jury selection in the death penalty trial of Parkland school shooter Nikolas Cruz is set to resume on Monday.

Jury selection in the death penalty case of confessed Parkland school shooter Nikolas Cruz has lapsed into chaos.

Manuel Oliver's son, Joaquin, was killed in the mass shooting four years ago.

The Department of Justice has reached a settlement with parents of the Parkland shooting victims.

Nikolas Cruz is pleading guilty in the Parkland, Florida, mass shooting.

Nikolas Cruz wants to change to a guilty plea for the killing of 17 people in the Parkland, Florida, high school massacre.

Three years later, Lauren Hogg pushes through daily post-traumatic stress to fight for gun reform that she says is vital to protecting the youth of the future.

One of the officers fired over their handling of the 2018 Parkland shooting will be reinstated, according to his union.

Brandon Fleury, 22, was sentenced to 66 months in federal prison on Monday for cyberstalking and sending a kidnapping threat to Parkland families.

The documentary "After Parkland" chronicles families' lives in the aftermath of the Marjory Stoneman Douglas High School shooting.

Family members are pushing for a new law requiring silent alarms in all New York state public schools in honor of one of the victims of the Parkland shooting.

Some messages were sent on Instagram from the username "the.douglas.shooter."

The office's new leader said it's wrong to punish the office for the "previous administration’s mishandling."

Kyle Kashuv, 18, disclosed the news on Twitter, claiming Harvard had rescinded its offer after screenshots surfaced of him using racial slurs at the age of 16.

Scot Peterson has been hit with charge regarding his inaction at Marjory Stoneman Douglas High School in Parkland, Fla., last Feb. 14.

An investigation determined that former deputy Scot Peterson failed to confront the gunman.

Scot Peterson, 56, was terminated from his job at the sheriff's office.

Retired Miami Heat star Dwyane Wade surprised graduates at Marjory Stoneman Douglas High School in Parkland, Florida.

Three apparent suicides struck mass shooting towns in just 10 days.

The Marjory Stoneman Douglas High School student was found dead Saturday night, according to the Coral Springs Police Department.

One of the teens was a friend of Parkland massacre victim Meadow Pollack.

Sydney Aiello, 19, died on Sunday, according to officials.

Thursday marks the first anniversary of the deadly shooting.

"It’s like where we started and the fact that we are here talking to you almost a year later, and we are still going and growing -- it means the world," said one student.