The shooter who carried out the 2019 shooting in Dayton, OH had an "enduring fascination with mass violence."

The friend of the gunman who killed nine people in a popular nightlife district in Dayton, Ohio, in August has pleaded guilty to federal firearms charges.

Ohio officials are pushing to strengthen the state and federal background check systems in an effort to stop people from getting guns when they have warrants.

Gov. Mike DeWine announced his proposal to mandate that arrest warrants and protective orders be put in the background check system.

Comedian Dave Chappelle is using his fame to help the community in Dayton, Ohio, recover after a shooting in its popular Oregon District killed nine people.

Connor Betts allegedly killed nine people, including his sister.

The alleged shooter who killed nine in Dayton, Ohio, was found to have cocaine, alcohol and anti-anxiety drugs in his system.

A pipe device containing cocaine was found in the alleged shooter's pocket.

The funeral home published a glowing obituary for the man who allegedly shot 26 people, calling him "funny, articulate and intelligent" but not mentioning how he died.

The footage shows that in just 32 seconds, more than a dozen people were hurt and nine people were killed, including the shooter's own sibling.

Nine were killed in the Aug. 4 massacre.

Surveillance video and images show Connor Betts arriving in the area of the shooting with his sister and a friend at around 11 p.m., about two hours before the shooting began, according to officials.

Federal charges have been filed against a friend of the gunman in a shooting in Dayton, Ohio, that killed nine people.

Prosecutors say Ethan Kollie bought body armor and ammunition that Connor Betts used to allegedly kill nine people. Officials said it does not appear Kollie knew how Betts would use the equipment.

One week after the Dayton shooting, singer John Legend visited the survivors to bring comfort and send a message of hope.

Family and friends of six of the victims in last week's massacre in Dayton, Ohio, mourned their loved ones Saturday in the first set of heart-wrenching funerals.

Services for the victims of the Dayton mass shooting began Saturday, just two two days after the first funeral was held for a victim of the El Paso massacre.

Alleged Dayton gunman Connor Betts demonstrated hate in the form of misogyny, which follows a pattern in mass shootings.

One woman saw her brother just hours before the shooting, grateful to have a happy final memory of him.

In the lead up to his visit, Dayton Mayor Nan Whaley said that she planned to tell him "how unhelpful he's been" on the issue of gun reform.

Jeremy Ganger, a bouncer at Ned Peppers in Dayton, Ohio, told ABC News he grabbed as many people as he could and guarded the bar's entrance to keep them safe.

Jeremy Ganger, a bouncer at Ned Peppers, said he grabbed as many people as he could and guarded the bar's entrance to keep them safe.

One-on-one with Jeremy Ganger, the bouncer at Ned Peppers in Dayton, Ohio. He recalls the moment he saw the alleged gunman approach the bar and his mission to protect everyone inside.

Jeremy Ganger, who pushed as many people as he could into the bar as the shootings occurred, came face-to-face with the suspect before the gunman was shot by police.

President Trump landed in Dayton, Ohio, as demonstrators protested his arrival to the city.

The family put out a statement Tuesday night, which was read by police Chief Doug Doherty of the Belbrook Police Department.

The New Jersey senator spoke at the Mother Emanuel AME Church following the deadly mass shootings in El Paso and Dayton.

President Trump called the Dayton shooter "a fan of Bernie Sanders and Elizabeth Warren. Nothing to do with Trump, but nobody mentions that."

Connor Betts' put out a statement Tuesday night, which was read by the local police chief, saying that they are "shocked and devastated by the events of Sunday morning."

Red flag laws designed to take guns away from dangerous individuals may be one of the only measures with a realistic chance of getting through Congress.

The ex-girlfriend of the suspected shooter who opened fire in Dayton this weekend said that they spoke openly about mental illness and suicidal thoughts.

Dayton Mayor Nan Whaley said that she plans to tell President Trump "how unhelpful he's been on this," regarding his comments about ways to tackle gun violence.

Authorities investigating Sunday's mass shooting in Ohio have determined that the gunman had been exploring violent ideologies prior to the shooting.

Dayton Mayor Nan Whaley said that she plans to tell President Trump "how unhelpful he's been on this," regarding his comments about ways to tackle gun violence.

The ex-girlfriend of the gunman said he was suspended from high school for having a hit list of classmates.

The surveillance video shows people on a bustling Dayton, Ohio, street running into a bar to get away from the suspect, who was shot by police near the bar's entrance.

Gov. Mike DeWine proposed actions designed to help those with mental health issues and prevent future mass shootings.

Mourners at a vigil at the Ohio Statehouse demanded action from government officials after a gunman opened fire in a busy downtown area, killing nine people.

At least nine people were killed and 27 others were injured at the Ohio shooting early Sunday morning, which occurred about 13 hours after the one in El Paso, Texas.

A witness who survived the shooting, Alexandria Lark, recalled the gunman being at the door of the bar she was in line for and saw a victim two inches away from her get shot.

There could have been more fatalities in the Ohio shooting if first responders didn't arrive quickly.

Surveillance footage showed people running into the bar to escape; Connor Betts, 24, was carrying 200-round-capacity magazines and allegedly fired 41 times, police said.

Holly Redman, a witness to the Dayton, Ohio, shooting, broke down while talking about how she tried to save a victim.

Officials investigating the mass shooting in Dayton's Oregon district say the shooter was carrying more than 250 rounds.

ABC News Chief Medical Correspondent Dr. Jen Ashton talks with psychiatrist Jess Clemons about how to help yourself through the shootings' trauma.

At least nine people killed, 26 injured in a mass shooting in downtown Dayton, Ohio, overnight Sunday.

Families have been meeting up with their loved ones at the convention center in town as the community grapples with what transpired at the typically safe and popular tourist destination.

As of 10 a.m. Sunday morning, 27 patients have been treated at nearby hospitals and 15 of those have been discharged, according to Mayor Nan Whaley.

Bellbrook, Ohio, police Chief Doug Doherty said his department is assisting Dayton police and FBI agents in their ongoing efforts.

The nation is devastated by yet another mass shooting, this time in Dayton, Ohio, as a popular nightlife area was attacked by a lone gunman.