CHICAGO (WLS) — A group of Chicago police officers received commendations for their successful efforts in apprehending the suspected arsonist linked to the tragic death of firefighter Michael Altman.

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In a heartfelt gesture, Chicago Fire Department Commissioner Nance-Holt expressed her gratitude to the officers involved in this critical case.

Commissioner Nance-Holt described the occasion as a bittersweet juncture, as both the department and Altman’s family continue to mourn his loss.

A total of fourteen officers from the Chicago Police Department were acknowledged for their dedicated work on this investigation.

During a ceremony held on Thursday, these relentless investigators were awarded for their tireless efforts that led to the suspect’s arrest.

“You collaborated with our department to piece this together,” Nance-Holt remarked. “While it can’t bring him back, we can assure the family that the person responsible is in custody, alleviating some of this nightmare for everyone.”

Altman died of his injuries after he fell through the first floor of a burning apartment building in Rogers Park in March.

Through interviews and surveillance video, investigators say they learned 27-year-old Sheaves Slate had trespassed and got in an argument with people in the building the night before the fire.

“Members of the Area Three technology center scoured hours of surveillance video and retrieved images from the area of the fire through the video Slate was observed leaving the scene as the firemen arrived and he dyed his hair and discarded the clothing he was wearing, ” Executive Director of Chicago Police Memorial Foundation Art Hannus said.

Officers say Slate eventually admitted to setting a mattress on fire in the basement.

Altman was a fourth-generation firefighter. His wife welcomed their second baby, the day before Altman’s funeral was supposed to take place .

“If he wouldn’t have done that, we wouldn’t be standing here talking about him in past tense. So, I am angry, in a way,” Nance-Holt said.

Slate has since been charged with first-degree murder and aggravated arson. He is detained while he waits for trial.