A hundred survivors and family members of victims of the deadliest mass shooting in Maine's history announced Tuesday their intent to sue the military.

A hundred survivors and family members of victims of the deadliest mass shooting in Maine's history announced Tuesday their intent to sue the military.

The independent commission investigating what led up to Robert Card's Oct. 25 mass shooting in Lewiston, Maine, released an interim report on what they have found.

Robert Card, the man who killed 18 in the Lewiston, Maine mass shooting last year, “likely” suffered from traumatic brain injury, according to a report.

The footage is from months before the suspected gunman killed 18 people and wounded 13 others. Authorities were responding to concerns from fellow Army Reservists worried about his mental health.

Alleged Maine gunman told police he was 'capable' of doing something 3 months before shooting

ABC News’ Kyra Phillips visited with families of deaf victims to see how they’re healing, supporting each other, and memorializing those lost in the mass shooting.

ABC News correspondent Kyra Phillips speaks with members of Lewiston’s deaf community following a mass shooting that happened in Maine in October.

In the two months since the Lewiston, Maine, mass shooting, the community has worked to help the victims' families work through their pain.

Police were told by an Army Reserve unit company commander they were obligated to take those concerns "very seriously," but needed to take it "with a grain of salt."

An independent report released Thursday found that local authorities responded reasonably to concerns about the mental health of the Maine shooting suspect.

The brain of alleged Maine mass shooter Robert Card is being studied to determine whether his reported mental health problems could be linked to brain damage sustained during his military service.

The brain of the Maine mass shooter is being studied to find out if his mental health deterioration could be linked to brain damage sustained during his military service.

Alleged Maine gunman Robert Card threatened bakery employees in New Hampshire that he might "snap" six days before the October 25 mass shootings in Lewiston.

Polling says most Americans want stricter gun laws but don't think they'll get them.

ABC News' Trevor Ault is at the Central Maine Medical Center where many of the injured in the Lewiston mass shooting are being treated.

The multi-state manhunt for the suspect in that mass shooting in Maine has ended as police find his body.

President Joe Biden and first lady Jill Biden visited Lewiston, Maine, to grieve with a community reeling from a mass shooting that left 18 people dead.

Funerals for victims have begun and the Army reserve has launched an internal investigation into the gunman.

President Joe Biden traveled to Lewiston, Maine, and joined other lawmakers to lay wreaths at two sites to remember the victims, offer support and comfort to families.

ABC News’ MaryAlice Parks discusses President Joe Biden’s visit to Lewiston, Maine where he’ll meet with families impacted by the mass shooting.

ABC News' Karen Travers talks about the Bidens’ trip to Lewiston, Maine, to speak to those affected by the recent mass shooting.

Gov. Janet Mills said she's launching an independent commission to investigate the shooting and police response.

Fellow reservist feared Maine gunman had guns, might "snap."

Lewiston High beat their rivals, with thousands paying tribute to first responders and victims of last week's shootings. James Taylor and Will Ferrell also appeared. ABC News' Andrew Dymburt reports.

More details are emerging about Robert Card, the suspected gunman in the mass shooting that unfolded at a bowling alley and bar in Lewiston, Maine, last week.

The suspected Maine gunman allegedly targeted a bowling alley and bar he believed were broadcasting messages that he was a pedophile, according to an arrest warrant.

Officials are defending their response as a new report claims there were delays and communication problems during the manhunt for the shooter. ABC News' Andrew Dymburt has the details.

ABC News’ Linsey Davis spoke with attorney Joshua Koskoff, who successfully sued gunmaker Remington over the Sandy Hook massacre, giving new hope to shooting victims.

Robert Card displayed signs that his mental health was on a drastic decline, prompting his family to warn law enforcement that something needed to be done, according to documents obtained by ABC News.

ABC News’ Pierre Thomas discusses missed warning signs from the Maine mass shooter.

As far back as January, Card’s mental health had started to decline, his family said. By May it was getting even worse, and they were concerned for his well-being.

Alarming new details reveal declining mental health that led his family to reach out to law enforcement months before the massacre.

Before last week's mass shooting in Maine that left 18 dead and 13 wounded, the U.S. Army says suspect Robert Card's commander was told he should not have a weapon.

Authorities on Friday discovered the body of Robert Card. He died of an apparent self-inflicted gunshot wound, officials said.

The alleged Maine gunman, Robert Card, tried to buy a silencer for a rifle at a local firearms store three months prior to the mass shooting, the owner said Saturday.

A gun dealer says a few months before the massacre that left 18 dead, the suspect tried to buy a gun silencer he'd ordered online but was turned away.

ABC News’ Trevor Ault reports after learning exclusive details from his visit to a gun shop.

This is how the mass shootings in Lewiston, Maine, unfolded.

Following the mass shooting in Lewiston, Maine, that left 18 dead on Wednesday night, authorities and family members identified the victims.

The suspect in a mass shooting in Maine that killed at least 18 people and wounded 13 others was found dead after a massive manhunt, officials said.

Maine's commissioner of public safety Michael Sauschuck delivers an update after officials found mass shooting suspect Robert Card dead Friday night.

The shooting, which left at least 18 people dead, unfolded in multiple locations, including a bowling alley and a local bar in Lewiston, Maine, officials said.

ABC News' Phil Lipof spoke with Maine State Sen. Margaret Rotundo about the ongoing manhunt to catch the suspected gunman who killed 18 people in Lewiston.

Gov. Janet Mills said that the city could begin to move forward on a difficult road to healing.

Law enforcement found shooting suspect Robert Card dead from a self-inflicted gunshot, officials said.

Robert Card, the suspect in the Maine mass shooting, was found dead by a self-inflicted gunshot wound, authorities said Friday.

Robert Card was found dead after a two-day manhunt, officials said.

Relatives of the people who were killed in this week's mass shooting opened up about their loss.

The stay-at-home order for four towns in Maine has been lifted, but the manhunt for shooting suspect Robert Card continues.