Rosario Ramirez-Lujan was 25 and living in Platteville, Colorado when he was last seen on November 7, 2001. He is described as a white male, black hair, brown eyes, 5 feet 7 inches, about 130 pounds. The clothing last reported: a green and black flannel jacket, white t-shirt, blue jeans and wine-colored work boots.

The Platteville Police Department opened an investigation under case number PP01-000721 and entered his case into NamUs as MP25959. Investigators say the circumstances of his disappearance remain undefined, with no clear indication of foul play; the case has since become a cold case but remains open.

If anyone knew Rosario, saw him around Platteville in November 2001, or has information that could help resolve this case, please contact the Platteville Police Department.