DENVER (KDVR) — The Littleton Police Department is looking for help solving a cold case that first led to charges in 2019.

Charlene Voight was last seen on June 30, 2016, and police suspect that she has been murdered. However, despite extensive investigations and multiple searches, her remains have never been located.

At the time, Voight was living with her boyfriend, Jeffery Scott Beier. He was indicted in 2019 on multiple charges related to the case, including first-degree murder, sexual assault and tampering with evidence.

Police say that Beier fled to Russia shortly after Voight's disappearance and has been able to avoid extradition. Littleton police are working with partner agencies to try and bring Beier to the U.S., where he would face the charges.

The agency is asking the public for any information that could help lead to justice in this case and bring closure to Voight's family.

Anyone with information is asked to contact the Metro Denver Crime Stoppers at 720-913-7867. Tipsters could earn a cash reward of up to $2,000.