Anne Marie Hochhalter, who was partially paralyzed in the Columbine High School shooting but found the strength to forgive one of the gunman’s parents, has died

ABC News’ Linsey Davis speaks to the mother and aunt of now-18-year-old Ralph Yarl who was shot almost two years ago after ringing Andrew Lester’s doorbell, not realizing he was at the wrong house.

Andrew Lester pleaded guilty to second-degree assault charges against Ralph Yarl in a 10-minute Missouri court hearing on Friday.

A tip to an anonymous hotline leads to arrest of teenager in central Indiana who police say was plotting to carry out a mass shooting at her high school on Friday.

Police in Puerto Rico say two children have been killed and four people were wounded when gunmen opened fire on a home in the island's northeast

Lawyers will give their closing arguments at the trial of rapper A$AP Rocky, who is accused of two felony counts of assault with a semi-automatic firearm

A former rapper is advocating for violent teens to receive a second chance at life.

One person was killed and five others were injured in a shooting at a facility in New Albany, Ohio, police said.

The firearm found on the suspect in the murder of the UnitedHealthcare CEO is believed to have been an untraceable ghost gun, according to police.

"It is a very painful day for all of Sweden," Prime Minister Ulf Kristersson said in a statement posted on social media.

Witnesses who survived Sweden’s worst mass shooting have described horror and panic that gripped an adult education center west of Stockholm as the gunman killed at least 10 people

The suspect is among those killed in the shooting, according to a Swedish police spokesperson.

Two people were shot and killed inside a grocery store in Indiana on Monday, officials told ABC News.

Two people were shot and killed inside a grocery store in Indiana on Monday, officials told ABC News.

The gunmen who shot and killed a 7-year-old boy, Breon Allen, are at large, and a $18,000 reward is being offered for information leading to their arrests.

Authorities in Florida are searching for the gunmen who "callously" shot and killed a 7-year-old boy. An $18,000 reward is available for information leading to arrests.

An arrest has been made in the shooting of a U.S. Border Patrol agent during a traffic stop in Vermont, with unusual details about the suspects' alleged actions in the arrest affidavit.

A 17-year-old boy who opened fire in his Nashville high school's cafeteria fired a total of 10 shots from a 9 mm pistol within 17 seconds of entering the room.

Seven police officers were shot during an armed standoff in San Antonio on Wednesday night while responding to a call about a possible suicide.

A social media account connected to the Nashville high school shooting suspect may have been in contact with the suspected Wisconsin school shooter's account.

Officials say a 17-year-old student opened fire in Antioch High School’s cafeteria, killing a 16-year-old female student and wounding another before turning the gun on himself.

A 17-year-old opened fire at a Nashville high school on Wednesday, killing one student and wounding a second student, according to police.

A shooting at Antioch High School near Nashville, Tennessee, on Wednesday left one student dead and another wounded. The shooter, also a student, then turned the gun on himself.

A 17-year-old opened fire at a Nashville high school on Wednesday, killing one student and wounding a second student, according to police.

Antioch High School in Nashville is on lockdown after shots were fired inside the school, according to Metro Nashville Public Schools.

A police officer has been seriously injured after a suspect opened fire at authorities from inside a home, officials said.

The FBI is investigating a Border Patrol agent-involved shooting, according to a statement from the Vermont State Police.

A 40-year-old mother was one of six people shot in a New York City convenience store when she was used as a shield by a suspected target, authorities said.

Ten people were shot after several men opened fire at a group of people waiting outside of a music venue in Queens, New York, the NYPD said.

Four family members, including three Americans, were shot in an attack in Durango, Mexico, that left three of the four dead, officials said.

Jennifer Crumbley, the mother of Michigan high school shooter Ethan Crumbley, is asking to be released from prison on bond pending her appeal outcome.

A Christmas night shooting and stabbing at Phoenix Sky Harbor International Airport resulted in three people shot and one stabbed, police said.

Authorities say the incident took place at a restaurant outside of security checkpoints at Phoenix Sky Harbor International Airport's Terminal 4.

Two people were killed and another six injured in the shooting at Abundant Life Christian School in Madison, Wisconsin, police said.

Police are investigating the online footprint of the 15-year-old girl who allegedly opened fire at her Madison, Wisconsin, Christian school.

Gunfire erupted in Towson, Maryland, on Tuesday evening, leaving 1 person dead and 9 others wounded, according to police.

Wisconsin has a number of firearm-related laws in effect that limit access to children and individuals with a history of violence.

Gunfire erupted in Towson, Maryland, on Tuesday evening, leaving 1 person dead and 9 others wounded, according to police.

A 15-year-old girl allegedly opened fire with a handgun at Abundant Life Christian School in Madison, Wisconsin, killing a teacher and a fellow student.

The shooting happened inside a classroom at Abundant Life Christian School during a study hall of students from multiple grades, police said.

Investigators said 15-year-old suspect Natalie "Samantha" Rupnow fatally shot a fellow student and a teacher before taking her own life at the Madison, Wisconsin, school on Monday.

ABC News’ Linsey Davis speaks with former FBI special agent and profiler Mary Ellen O'Toole about what we know about the teenage girl accused of the shooting at a school in Madison, Wisconsin.

Rep. Mark Pocan says his community is experiencing tragedy because Americans are "addicted to guns."

The shooter was a 15-year-old student, officials said on Monday. Natalie Rupnow, who went by Samantha, died of an apparent self-inflicted gunshot wound.

A teacher and teenage student were killed and six others hurt in a shooting at Abundant Life Christian School in Madison, Wisconsin, on Monday, police said.

The teenage girl alleged to have shot seven victims, two fatally, in an attack on Monday at a Wisconsin school marks the rare occurrence of a female school shooter.

Former FBI and profiler Ellen O’Toole discusses the 15-year-old girl suspect that allegedly shot seven victims, two fatally, in an attack on Monday at a Wisconsin Christian school.

A 15-year-old student killed a teacher and another student in a shooting at the Abundant Life Christian School in Madison, Wisconsin, on Monday, police said.

A man was inside the apartment and was arrested and charged with cruelty to children, police said.

Authorities in Wisconsin are working to figure out what led a 15-year-old student to open fire at Abundant Life Christian School, killing a teacher and fellow student in study hall.