Liechti was one of three people accused in the stabbing death of Mr Berry, allegedly carried out as part of a robbery. Mr Berry’s body was recovered from the Third Fork of the Platte River near Easton.
Co-defendant Kelli Hoard also pleaded guilty to one count of second-degree murder last week, and is scheduled for sentencing in December.
A third defendant did not accept a plea offer. Primalton Peterson III is scheduled for trial in January on charges of first-degree murder, armed criminal action, and abandonment of a corpse.