The Boulder Police Department early Tuesday released the identity of the suspect who allegedly shot and killed 10 people, including one of its own officers.

Ahmad Al Aliwi Alissa, 21, of Arvada was arrested about 3:30 p.m. Monday at the King Soopers on Table Mesa Drive. He faces 10 counts of first-degree murder.

Alissa was pictured in a live-steaming video being led from the store in handcuffs and wearing only underwear. His right leg appeared to be covered in blood.

Boulder Police Chief Maris Herold said at a news conference early Tuesday that Alissa suffered a through-and-through gunshot wound and was treated at a hospital until early Tuesday.

20th Judicial District Attorney Michael Dougherty said Alissa will be transferred to the Boulder County Sheriff’s Office jail on Tuesday.

An arrest affidavit was released later Tuesday. Authorities say Alissa bought the rifle used in the killings six days earlier.

Alissa’s Facebook page, which was taken down by 10 a.m. Tuesday, showed his name as “Ahmad Al Issa.” It showed his interests as “Metro university … computer engineering/computer science … kickboxing.”

Some of his posts mentioned praising Allah, kickboxing and UFC fights and (in 2019 at least) wanting a girlfriend.

A spokesman from Metropolitan State University said Alissa is not, nor ever has been, a student there.

Court records show Alissa was charged with third-degree assault, knowingly/recklessly causing injury, November 2017 by the Arvada Police Department.

Court records show Alissa was arrested in 2017 after he “cold-cocked” a classmate in the head. Alissa reportedly punched the boy several times in the head after he “had made fun of him and called him racial names weeks earlier,” court documents stated.

He pleaded guilty in 2018 and was sentenced to one year probation, 48 hours of community service and fees/court costs.

A Facebook friend of Alissa named Bruce Niyonkuru texted via Facebook messenger that he was on the wrestling team with the alleged shooter in 2014-15, before he transferred to another high school. 

“He was normal. He just kept to himself and only spoke to those who he normally talked to,” Niyonkuru wrote. “I don’t remember him ever being in a fight or starting a problem with anyone.”

Some media reports had Alissa attending and graduating from Arvada West High School in 2017. 

Alissa’s Arvada home had cameras and media representatives out front Tuesday afternoon. Neighbors and former Arvada neighbors were either not home, not answering the door or declined comment. 

Ali Aliwi Alissa, the suspect’s 34-year-old brother, told The Daily Beast that authorities searched his house all night after the shooting.

Alissa said his brother was “very anti-social” and paranoid, adding that, in high school, he would describe “being chased, someone is behind him, someone is looking for him.”

“When he was having lunch with my sister in a restaurant, he said, ‘People are in the parking lot, they are looking for me.’ She went out, and there was no one. We didn’t know what was going on in his head,” Alissa said, admitting that he believes his brother is mentally ill.

Dougherty said early Tuesday: “This killer’s name will live in infamy, but today let us remember the victims and work tirelessly for them.”