In photos: Victims remembered at Sunday’s vigil

What happened after Card’s release from a 14-day stay at a mental health facility

After two weeks in a mental health facility in July in New York following concerns from fellow soldiers about his wellbeing, Card was released. Police were asked to conduct a welfare check on Card in September after he was accused of punching a fellow soldier.

Card and the soldier were driving home from a casino when he started talking about people calling him a paedophile, the National Guard said in a statement to Sagadahoc County Sheriff’s Office.

“When [his friend] told him to knock it off because he was going to get into trouble talking about shooting up places and people, [he] punched him,” the statement said.

“According to [the friend], [he] said he has guns and is going to shoot up the drill center at Saco and other places … [the friend] is concerned that [he] is going to snap and commit a mass shooting.”

An Army spokesperson confirmed Card’s unit had requested a health and welfare check from the sheriff’s office.

“In September, the Sagadahoc County Sheriff’s office responded to a health and welfare check requested by Sgt. 1st Class Robert Card’s unit out of an abundance of caution after the unit became concerned for his safety,” Lt Col Ruth Castro told CNN.

A message from the Maine State Police about the Family Assistance Center

Starting Wednesday, November 1st, the Family Assistance Center located at the Lewiston Armory, 65 Central Ave, Lewiston will have modified hours of 10:00AM to 5:00PM.

Victims and their families directly impacted by the incidents may continue to receive resources of support and access to resources at this location.

For those who had personal effects left at the scenes you can pick those items up from the Lewiston Armory during these business hours.

Chilling words from the sheriff’s office revealed

In a letter written by an officer regarding a 15 September welfare check on Robert Card, the officer lays out concerns from the Maine National Guard.

As of recent it has come to the Guard’s attention that Card is having psychotic episodes where he is hearing voices that are insulting him calling him a pedophile. Card is also making threats to shoot up the Saco National Guard facility.

He had been committed over the summer for a couple of weeks due to his altered mental state but has been since released. I have been asked by the National Guard to identify any specific individuals who were concerned for Card whereas he may focus his altered aggression toward them as he has already demonstrated.

It should be noted that Card is a firearms instructor with the Guard so utmost caution must be utilized.

The six missed warning signs before the shooting that beg the question: Could this have been prevented?

Almost a week after a horrifying mass shooting left 18 people dead in Lewiston, Maine, questions are mounting over whether the atrocity could have been prevented altogether.

Information continues to emerge about warning signs around suspected shooter Robert Card – including concerns raised by his family and the Army alike – stemming back months before the massacre.

The first known warning came back in May, five months before the shooting, when Card’s family alerted the Sagadahoc County Sheriff’s office with concerns about his mental health and his access to guns.

In July, Card was put under psychiatric evaluation for two weeks after an incident with fellow Army soldiers.

In September, the Army Reserve contacted the sheriff’s office seeking a welfare check on Card over a fellow soldier’s concern that he would carry out a mass shooting. Authorities responded by issuing an alert to law enforcement agencies statewide which cautioned that Card was “known to be armed and dangerous” and was suffering from psychotic episodes.

That alert was cancelled exactly one week before Card allegedly opened fire on two Lewiston businesses, killing 18 people and wounding 13 others. He was found dead by apparent suicide two days later.

In the aftermath of the shooting, authorities are facing mounting pressure to explain whether they could have done more to stop the tragedy, given the warnings on record.

Heartbreaking final text to Maine mass shooting victim who died trying to take down Card, revealed

Thomas “Tommy” Conrad had been planning on doing a pumpkin carving at the bowling alley for the kids in the Lewiston community before a gunman opened fire in a mass shooting that claimed the lives of 18 people.

Now, mourners are leaving Jack-o-lanterns outside Just-In-Time Recreation as a tribute for the 34-year-old manager, who was killed in the attack while trying to take down the shooter.

A GoFundMe created for Conrad’s family describes him as a man who was “devoted to his job, his game and his young daughter, Caroline.”

“He died a hero,” the campaign stated. “He put his life in harm’s way to charge the gunman and save the children who were there.”

Sagadahoc County Sheriff Joel Merry sheds light on concerns from family and fellow soldiers ahead of the shooting

WATCH: Maine Gov Janet Mills snap at reporters asking about missed warning signs

Another missed warning signed revealed: suspected shooter spoke ‘aggressively’ about guns

NBC News spoke to Card’s former Maine Recycling Corporation coworkers, revealing yet another missed warning sign ahead of this year’s deadliest shooting.

According to the ex-colleague, Card’s behaviour became more erratic and he spoke “aggressively” about guns before he left his job. Another colleague said a supervisor was warned that Card had allegedly had made gun violence threats in the workplace, but the complaint felt like “it was swept under the rug.”

One colleague said issues started cropping up a year after Card began working at the recycling facility; Card displayed a “total mood change,” the source said.

“He irrationally snapped. We’d do good the whole day, but then would say that I touched him. He said I was sexually harassing him, calling him a pedophile,” the coworker said.

Card apparently spoke of guns frequently, including his desire to purchase a silencer — which he was ultimately unable to do. “I knew it was going to come eventually. I said, ‘One day, he’s probably going to shoot someone up,’” this colleague said. “He was bringing up guns heavily and aggressively. It was a very weird situation.”