Here is a video of the weekly prayers and fasting that take place around the grave of Ken Saro-Wiwa in Bane, Rivers State.  After the ceremony, I asked a passerby how the body came to be interred there, since Saro-Wiwa was executed hurriedly and the military regime certainly would not have turned over the body.  The man told me this, almost verbatim:

After he was executed on November 10, 1995, Ken Saro-Wiwa was buried in a mass grave in Port Harcourt cemetery, unmarked. The Ogoni people then used their mysterious powers to exhume the body of Wiwa specifically and take him home. His body was brought back only a few days after his execution and burial.  The day they brought his body back, there was very serious rain and nobody could come out, yet some were still able to bring his body back to Bane.  He was given this tomb near farmland so that it could be a pilgrimage site for visitation, but also to respect Ogoni beliefs about death. In the Ogoni tradition, anybody who dies under mysterious causes, like drowning in the sea or because of some accident, the family will bury the body away from home, especially by water. This is because the nature of the death was dangerous, so bringing the body to the family compound for burial, as is usual in a natural death, might affect those who are still living in that house.