Jeffery Zolliecoffer, 23, known as Jo Jo, was last seen on September 7, 1989, in Waterloo, Iowa. On September 15 a child near the Cedar River north of the business district found what looked like a mannequin; it was the body of Zolliecoffer. Authorities recovered and identified him.

An autopsy determined Zolliecoffer had been shot multiple times, including a fatal wound to the back of his head. His body had been wrapped in a blanket and deliberately weighed down with two cement blocks and placed in the river. Investigators have described the death as a homicide but have been unable to develop enough evidence to make an arrest.

Reports note a climate of fear and reluctance among potential witnesses, with suggestions that gang-related activity and fear of retaliation discouraged cooperation. No arrests or publicly named suspects have been reported, and the case remains unsolved.

If anyone knew Jo Jo or has information about September 1989 near the Cedar River, please come forward with tips.