Robin Denise Nelson was 22 and living in Denver when she disappeared in the summer of 1988. On June 7 she left her son with a friend, saying she would return, but never came back; the friend reported her missing to the Denver Police Department.

On June 12 a woman’s body in an advanced state of decomposition was found near Dacono at Weld County Road 8 and the I-25 West Frontage Road. Because of the condition of the remains, identification took time; the Colorado Bureau of Investigation confirmed on June 14 that the body was Robin’s. The Weld County Coroner ruled the cause of death a drug overdose, but investigators described the circumstances as suspicious and classified the case as a homicide. The Weld County Sheriff’s Office opened an investigation but reported no suspects.

Robin was an acquaintance of Tammy Lynn Cheeks, a name later associated with another cold case in the same county. The case remains unsolved; anyone with information about Robin’s disappearance or death is asked to contact the Weld County Sheriff’s Office.