This guy spray painted everywhere. If you're from Detroit or frequent the city you've seen his stuff.
Forever nobody had any idea who he was, so he became known as the Turtle or "Turdl". He had a fairly simple or stylized image of a turtle painted in number or various positions. This guy had a price on his head by art galleries and police alike.
Turns out he is Ronald Scherz of Warren Michigan. He says he is no longer the Turdl.