A potential juror wore a T-shirt that could be prejudicial to his case.

Jury selection in the penalty trial of Florida school shooter Nikolas Cruz has entered its second phase with the attorneys asking questions of potential jurors individually

Eden Hebron witnessed a gunman kill a close friend and two other students.

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

Nikolas Cruz, 23, has pleaded guilty to 17 counts of murder.

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

Jury selection in the trial of Florida school shooter Nikolas Cruz must start over after a dispute over a possible judge's error

Jury selection in the deadliest U.S. mass shooting ever to go to trial has begun

Nikolas Cruz's jury selection is to begin after years of maneuvering and delays.

Attorneys for Florida school shooter Nikolas Cruz and prosecutors are arguing over whether his jury should tour the blood-stained, bullet-pocked classroom building where he murdered 17 people four years ago

ABC News’ Linsey Davis speaks to Manuel Oliver, father of Parkland shooting victim Joaquin Oliver, about his efforts to stop gun violence in America on the anniversary of his son’s death.

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

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

Manuel Oliver climbed a crane in Washington on Monday, four years after 17 people were gunned down at Stoneman Douglas High School in Parkland, Florida, to demand action on gun violence.

A judge has postponed the penalty trial for Florida school shooter Nikolas Cruz to Feb. 21

A South Florida school district will pay more than $26 million to the families of 17 people killed in the 2018 shooting massacre at Marjory Stoneman Douglas High School

A judge has rejected an attempt by Florida school shooter Nikolas Cruz’s attorneys to bar the parents of his 17 victims from testifying about the trauma the murders caused

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

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

The recent guilty plea by the shooter in the 2018 Parkland school slayings drew some renewed attention to the anti-gun March for Our Lives student movement

In an emotional day in court for Parkland families, Nikolas Cruz pleaded guilty to all 34 charges in the deadly school shooting that killed 17 students and staff.

Nicolas Cruz killed 17 people and wounded 17 more in the deadliest high school shooting in U.S. history.

Manuel Oliver lost his son in the shooting.

The shooter pleaded guilty to 17 counts of murder and 17 counts of attempted murder saying he is "very sorry" for what he did.

Nikolas Cruz spoke directly to the parents of slain students for the first time in court Wednesday. A jury will decide if 23-year-old Cruz will get the death penalty or life in prison.

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.

He is the suspect in the 2018 killing of 17 people at a Florida high school.

A judge says a former student accused of murdering 17 people at a Florida high school cannot be called “animal” or “that thing” during his upcoming trial

The superintendent of the Florida school district who was indicted on a perjury charge by a grand jury investigating the 2018 school massacre in Parkland will leave his job under a $740,000 severance package approved by a divided board

The South Florida school superintendent overseeing Parkland schools has offered to resign amid continuing criticism over the 2018 mass shooting there and a perjury charge from a statewide grand jury

The Florida school superintendent charged with lying to a grand jury probing the circumstances surrounding a 2018 massacre on one of his campuses has offered to step down

Lauren Hogg, a freshman during the shooting, co-founded March for Our Lives.

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.

It’s been more than 1,000 days since a gunman with an AR-15 rifle burst into a Florida high school, killing 17 people and wounded 17 others

Parents who sued a school district after their children died in a mass shooting at a Florida high school are being asked to turn over psychiatric records to prove they've suffered mental anguish

Gutenberg, whose new book is called "Find the Helpers," lost his 14-year-old daughter Jaime when she was killed in the 2018 school shooting in Parkland, Florida.

A deputy fired for his inaction during a school shooting will get his job back

A Florida couple regrets ever taking in a disturbed teenager in the months before he was accused of the 2018 massacre at Marjory Stoneman Douglas High School

Coby Mayo shares his story of surviving the Parkland shooting and being selected in the 4th round of the MLB draft by the Baltimore Orioles.

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

Sgt. Brian Miller was fired after he hid behind his car during the Parkland high school shooting, but officials rehired him after determining he was denied due process and improperly terminated.

Sgt. Brian Miller will receive full back pay and seniority when he returns to his duties at the Broward County Sheriff’s Office.

Sgt. Brian Miller was one of four officers who were fired last year after an investigation deemed they had "neglected their duties" during the shooting at Marjory Stoneman Douglas High School.

Two years after the Parkland school shootings, Florida lawmakers are close to sending Gov. Ron DeSantis legislation requiring panic buttons at schools

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

It was a bittersweet moment when representatives of the TV show “Military Makeover" surprised Parkland, Florida, shooting widow Debbi Hixon to let her know they were going to renovate her entire home

Today marks two years since 17 people were killed at Marjory Stoneman Douglas High School in Parkland, Florida.

The ABC Documentaries film shows how families affected by the 2018 shooting that killed 17 people at Marjory Stoneman Douglas High School coped in the aftermath and began working to end gun violence.

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