Twelve-year-old Jonelle Matthews disappeared from her home in Greeley, Colorado; her body was not discovered until 2019.

Jonelle Renee Matthews was a 12-year-old American girl who disappeared near Greeley, Colorado, on December 20, 1984. Her remains were discovered on July 24, 2019, by construction workers installing a new pipeline 15 miles (24 km) from her home. Steven Pankey was sentenced to life imprisonment on October 31, 2022, after his arrest and trial for Matthews's murder.

Greeley is the home rule municipality city that is the county seat of and the most populous municipality in Weld County, Colorado, United States. The city population was 108,795 at the 2020 United States census, an increase of 17.12% since the 2010 United States census. Greeley is the tenth most populous city in Colorado. Greeley is the principal city of the Greeley, CO Metropolitan Statistical Area and is a major city of the Front Range Urban Corridor. Greeley is located in northern Colorado and is situated 49 miles (79 km) north-northeast of the Colorado State Capitol in Denver. The city is a college town, home to the University of Northern Colorado and Aims Community College.