Louis Ronald Vargas was 13 when he was last seen in Chicago on October 12, 1977. He was described as a Hispanic male, brown hair, brown eyes, about 4 feet 10 inches, with noticeable scars on his knees. The Cook County Sheriff’s Police Department opened an investigation and his case is classified as endangered missing.

Few specifics about the circumstances of his disappearance are available. There are no publicly reported witnesses to an abduction or clear information about his state of mind that day, and investigators say the trail went cold. Over the years his case has sometimes been mentioned in the context of other missing boys from that era, including speculation about a link to John Wayne Gacy; no definitive evidence has been made public connecting Louis to Gacy.

If anyone has memories of Louis, knew where he spent time in October 1977, or has information that might help, please come forward to share what you know.