Troy Anthony Davis has spent 19 years on death row in the US for a murder he has always said he did not commit. No physical evidence links Troy to the crime. Seven out of nine witnesses on whose evidence he was convicted in 1991 have since changed or retracted their testimony, with some citing police coercion.
Troy was recently given an opportunity to present new evidence that could prove his innocence at a hearing in Savannah, Georgia. However, despite ongoing doubts about his guilt the judge ruled against Troy, putting him back on track for execution.
German street art collective, Mentalgassi, have teamed up with Amnesty to highlight Troy's case by creating unique lenticular posters (the image appears and disappears as you walk past) on fences across London.