Jessica Heeringa went missing while working the closing shift at a Norton Shores gas station on April 26th 2013. A spatter of blood found at the scene was determined to be hers. Authorities say they have persons of interest in the case but, two years later, no suspects.

On Sunday,, the web version of Unsolved Mysteries, will air a special on Jessica, including an interview with her mother -- something we haven't seen before, according to the Detroit Free Press.

Police are still asking for the public's help via a tip line at (231) 733-2691 or use a new anonymous tip line the family set up, (231) 222-0278.