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What we know about the Michigan State University gunman

East Lancing, Michigan - February 14: Police are seen at the scene on Lake Lansing Road where a body is seen on the side of the road hours after at least 5 people were injured on the MIchigan State University Campus. (Photo by Rey Del Rio for The Washington Post via Getty Images)

(CNN) — Authorities identified the gunman in the deadly mass shooting at Michigan State University as 43-year-old Anthony Dwayne McRae. Here’s what we know about him:

MSU shooter pleaded guilty to firearm charge in 2019, court records show

The gunman in the Michigan State University shooting previously pleaded guilty to a firearm charge.

McRae was arrested in 2019 and charged for carrying a concealed weapon without a permit, a felony. He later pleaded guilty to a misdemeanor for possession of a loaded firearm and spent a year and a half on probation.

Around 2 a.m. on June 7, 2019, according to court records, a Lansing Police Department officer saw McRae sitting on the back steps of an abandoned building smoking a cigarette. The officer, who was patrolling the area after burglaries in the vicinity, asked McRae if he had any weapons, and McRae said that he did.

The officer patted McRae down and confirmed that he had a loaded semi-automatic pistol in his pants pocket, as well as another magazine for the gun in his breast pocket.

McRae admitted that he did not have a concealed pistol license, and the officer arrested him. McRae told the officer he carried the gun for his safety and was trying to obtain a permit. The officer confirmed the gun was registered to McRae, according to court records.

A lawyer for McRae initially argued that the officer lacked probable cause to search him. But in November 2019, McRae pleaded guilty to possession of a loaded firearm as part of a plea agreement. McRae agreed to forfeit the gun involved in the case and was banned from owning weapons during his probation.

McRae was originally sentenced to a year of probation, but that was later extended to a year and a half. McRae was discharged from probation in May 2021, the court records show.

McRae’s sister says he was socially isolated

Melinda McRae, the gunman’s sister, told CNN she was “shocked” by the news and said she had “no idea” what motivated her brother to carry out the shooting.

McRae had long been socially isolated and clashed with his parents, though she said they had a loving home growing up. He had recently been living isolated in a room at their father’s home, she said.

She said McRae would often lash out at their mother, and then when she died in 2020, he would express deep sorrow and say, “I’m sorry mom, I’m sorry …”

“My mom said that Anthony is going to be the death of her,” she said, referring to his social hostility. “He’s always been like the oddball of the family. But he’s been taken care of. My parents took care of us.”

Melinda McRae said her brother was also prone to transience, would sporadically leave town and struggled to hold down jobs. “He would leave the state. He would keep leaving my mom and dad …”

At times he would go “to different cities and just live in a shelter,” she said.

Melinda McRae said she last saw her brother at their mother’s funeral in 2020.

“I’m just so sorry about the innocent people that got killed,” she said.

This is a developing story and will be updated.