The son of renowned Nigerian environmental activist Ken Saro-Wiwa, who was executed more than 20 years ago, has died in London.

Ken Saro-Wiwa Jr, 47, passed away after suffering a stroke, his family say.

He was a journalist who became an adviser to three presidents.

The 1995 execution of his father by a military government for leading protests against environmental degradation caused by the oil industry sparked global outrage.

Saro-Wiwa Sr led the Movement for the Survival of the Ogoni People (Mosop), which accused oil multinational Shell of destroying the environment in his home region of Ogoniland in south-eastern Nigeria. BBC reported.