The Hewitt Police Department is renewing calls for help solving its oldest cold case.

Detectives opened a homicide investigation in April 1978 after someone discovered the body of a man believed to be in his 20s or 30s with a single gunshot wound inside a drainage culvert in a field near Spring Valley Road and South Haven Drive.

Investigators were never able to identify the man, who was dubbed "Disco Dan." At the time, police described him as 5-foot-8 and weighing roughly 128 pounds. He had light brown shoulder-length hair, a mustache, goatee and brown eyes.

When he was found, "Disco Dan" was wearing a long-sleeve blue and white floral shirt with a white shell necklace that included black beads. There was a Snoopy medallion found next to his remains, according to a Facebook page seeking tips.

"Disco Dan" had three recognizable tattoos, according to a flyer seeking leads in the case. The tattoos included a cross inside a heart outline on his upper left arm, the letters "RB" on his upper right arm, and the word "PEACE" on his left forearm.

Anyone with information that could help police identify Disco Dan should contact the Hewitt Police Department at 254-666-6272 or message officers tips here.

You can find more details about the case on this Facebook page.