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The Georgia Bureau of Investigation identified those killed in the Apalachee High School shooting as Richard Aspinwall, 39; Cristina Irimie, 53; and Mason Schermerhorn and Christian Angulo, both 14.

Here’s what to know about them:

Richard Aspinwall: The math teacher was described as sweet and kind by sophomore Ariel Bowling, who was in Aspinwall’s geometry class her freshman year. Michael Gordon, another student, echoed that, telling CNN, “He was a good guy … I had him – I’m in tenth grade – so I had him for a whole year, and he taught me a lot.” Aspinwall was also an assistant football coach, serving as defensive coordinator for the Apalachee Wildcats football team.

Cristina Irimie: She was also an Apalachee High School math teacher, the school’s website shows. The beloved teacher was having a late birthday celebration with her students the day she was shot and killed, according to a family friend.

Irimie was dedicated to her students and treated them like her own, he said. “Cristina and her husband were not able to have any biological children of their own, so she decided to turn around and love her students as her own,” Caprar said.

Christian Angulo: He was described by his older sister as a “very good kid,” who was “very sweet and so caring.”

“He was so loved by many,” Lisette Angulo wrote on a GoFundMe campaign to raise money for his funeral, which included a photo of the teen with a cake on his 14th birthday. “He really didn’t deserve this.”

Mason Schermerhorn: The14-year-old was remembered by family friends as a “loving soul” and a “creative kid.”

“He was the sweetest most loving soul with the biggest smile and will be missed dearly,” a family friend wrote in a GoFundMe campaign for his family.

Mason was known for his good sense of humor, family friend Rebecca Good told CNN affiliate WXIA.

Read more about the victims.