Editor’s Note: A previous version of this story incorrectly listed Birkbeck as Gilmour’s current boyfriend. The two were not in a relationship at the time of Layton’s death. The Denver Gazette regrets the error.

A jury found a Douglas County woman guilty Friday in the 2022 death of her son from a fentanyl overdose.

Hanna Gilmour, 29, was convicted of felony child abuse resulting in death and misdemeanor child abuse for the death of her 22-month-old son, Layton, in November of 2022, according to a news release from the 23rd Judicial District Attorney’s Office.

Investigators discovered that the apartment shared by Hanna and her boyfriend was full of illegal substances, including cocaine and fentanyl, according to the release. Prosecutors alleged that Layton crawled onto the floor and accidentally ingested some of the fentanyl, which eventually led to his death.

“This was a senseless and preventable tragedy,” said 23rd Judicial District Chief Deputy District Attorney Jake Adkins, who prosecuted the case, in the release. “Every parent has a responsibility to protect their child. Instead, their mother created an environment so dangerous that it cost her son his life.”

The day Layton died, Jacob Birkbeck, the child’s father, was picking him up from Hanna’s apartment in Littleton as part of a routine custody exchange, according to the release. When he arrived, he said the child “didn’t look right,” a comment that Hanna laughed off before saying that Layton was just sleeping.

When Birkbeck arrived at his mother’s home a few minutes later, Layton was not breathing, the release says. The father then called 911; the child was later pronounced dead.

“It is impossible to measure the magnitude of the loss of such a young and innocent life, especially when it comes to the failure of the very person whose primary responsibility was to protect him,” said 23rd Judicial District Attorney George Brauchler in the release.

The district’s Chief Deputy District Attorney Danielle Jaramillo co-led the prosecution on the case, according to the release.

Hanna will be sentenced on Nov. 12 and faces between 16 and 48 years in prison.