A police lab helping investigate the killing of the iconic former president Thomas Sankara in Burkina Faso reported Monday that the state of his remains made it impossible to detect any DNA, according to a lawyer for the Sankara family. Mystery has long surrounded the death of the man dubbed "Africa's Che Guevara" who was killed in 1987 during the coup that brought his friend and former comrade-in-arms Blaise Compaore to power.