Albuquerque police fired tear gas into a home to get an adult suspect out, killing a 15-year-old boy.
The Albuquerque Police Department announced Sunday that Brett Rosenau had died as a result of smoke inhalation.
Qiaunt Kelley was wanted for violating probation for armed carjacking and stolen vehicle charges, officials said. Rosenau later entered Kelley's barricaded home.
SWAT and the Bernalillo County Sheriff's Office tried for hours to talk Kelley and Rosenau out of the house, police said.
Police used a drone and robots to "activate powder irritants" inside the home to force them out. Kelley opened the back door, lay down, and went back inside, officials said.
As a result of her injuries, Kelley was taken to a hospital and then booked into jail. He is now being investigated for a recent fatal shooting as well.
The body of Rosenau was discovered in the residence.
Police Chief Harold Medina said in a statement that "a young person tragically lost his life" in the pursuit of a violent criminal.
"I know many in our community are hurting, and I appreciate everyone's patience while the incident is investigated. If our actions caused his death, we'll make sure it never happens again. I've asked our Victim Services Unit to help the family during this difficult time.
"Devices used to introduce irritants into the home may have caused" the fire, Medina said.
Rosenau's mother wrote on a fundraising page that she wasn't prepared for the morning phone call. Mothers never imagine attending their child's funeral.