UPDATE: Police say a person of interest has been identified.
Ypsilanti Police tell 7 Action News the investigation continues, but they believe they have identified the person who defecated repeatedly in Prospect Park, even on a slide.
"The Ypsilanti Police Department continues to investigate the health & safety issue of the defecator in Prospect Park. We are investigating a person of interest possibly involved in these incidents," said Lt.Deric Gress of the Ypsilanti Police Department in a statement.
The news comes after an advertising agency stepped up to help identify the mystery pooper who is repeatedly striking an Ypsilanti playground.
Adams Outdoor Advertising agency asked for the public's help using a digital billboard on I-94.
They read, "Help us catch the poopetrator," "Do you civic doody, report the pooper," and "Help us flush the pooper."
The signage also includes the hashtag #ypsipooper. A Twitter handle under the same name has also been created.
Seven Action News asked police if the billboards helped them identify the person who some have said is "Public Enemy #2." Police say they are going to give the credit to good police work.
Todd McWilliams, the General Manager at Adams Outdoor Advertising, said the hope was that by raising awareness they could pressure the "pooper" to stop.