Walter Josef Fischer, who went by the moniker Oz, was polarizing figure who painted spirals, smiley faces and his pseudonym around Hamburg and elsewhere. The body of 64-year-old was found near railroad tracks in Hamburg near a spray paint can and a newly finished tag.

Oz came to prominence in Hamburg in the 1990s, but was only in recent years that galleries began to show his work. Controversy divided Hamburg citizens, some who considered his work as vandalism, while others enjoyed the light-hearted imagery. He spent a total of 8 years in prison for property damage.