A Colorado woman is facing murder charges after being extradited from the United Kingdom to the United States, authorities announced on Tuesday. Kimberlee Singler, 37, is accused of killing two of her young children amid a custody battle in December 2023.

Singler was apprehended in the UK on December 30, 2023, following allegations that she drugged and murdered her 9-year-old daughter and 7-year-old son. Additionally, her 11-year-old daughter was reportedly injured in the incident. After the alleged crimes, Singler fled to the UK, according to Colorado authorities.

During a news conference, Colorado District Attorney Michael Allen revealed that Singler is set to make her initial court appearance soon. She is facing several charges, including two counts of first-degree murder. Allen described the extradition and forthcoming court proceedings as a “momentous day.”

Initially, Singler claimed to police that an intruder was responsible for the violent acts against her children. This led investigators to treat her as a victim at first. However, evidence eventually led authorities to charge her with the heinous crimes.

Kimberlee Singler is now facing serious legal consequences, with charges including multiple counts of first-degree murder.

Authorities said Singler’s daughter initially corroborated her version of events but later changed her story.

When police later attempted to arrest Singler, she was gone. Authorities eventually found her in an upscale London neighborhood.

Colorado Springs Police Chief Adrian Vasquez called the extradition a “significant milestone” in the case, noting that Singler is accused of committing an “unthinkable” act.

Kimberlee Singler was arrested in the U.K. on Dec. 30, 2023, after police say she drugged and killed her 9-year-old daughter and 7-year-old son, and injured her 11-year-old daughter before fleeing overseas. (Parker Seibold/The Gazette via AP/ GoFundMe/ CSPD)

“Crimes as horrific as this are simply heart-wrenching,” he said. “They’re just simply sad. No person, much less a child, should ever have to go through something like this.”

In their crime scene investigation in December 2023, Colorado authorities located spent rounds, a blood-stained knife and empty bottles of sleeping pills in a trash can.

Police found the two dead children in bed together.

At the time of the crime, Colorado Springs police said they received a 911 call reporting a burglary from Singler’s address, but investigators later said evidence did not support a burglary.

Both the Federal Bureau of Investigation and Colorado Springs police went to London to apprehend Singler, who fought extradition and has denied harming her children.

Law enforcement are seen at a residence where two children were found dead inside, Dec. 19, 2023, in Colorado Springs, Colo. (Parker Seibold/The Gazette via AP, File)

In January 2025, a U.K. judge ruled that Singler could be extradited to the U.S. for trial, and her appeal was denied last month.

Her attorney argued against extradition, saying that Singler would be given a mandatory sentence of life without parole if convicted of first-degree murder in Colorado, which would violate a European human rights law.