Dale Diaz-DeLeon, 38, was last seen January 13, 2012, in Vancouver, Washington. He was described as Hispanic and White/Caucasian, with black hair and brown eyes, 5 feet 7 inches tall and about 150 pounds. His disappearance was entered into NamUs in November 2012.

In June 2017 partial human remains were recovered on the Columbia River shore in Cowlitz County, Washington. Forensic testing later confirmed the remains were those of Diaz-DeLeon. The discovery moved the matter from a missing person case to a death investigation, but the case remains open because only partial remains were recovered; the cause and manner of death have not been publicly detailed.

Anyone who knew Dale, saw him in January 2012, or has information about the Columbia River shoreline in that area is asked to come forward.