Menegian, one of the children of the late environmental activist, Ken Saro-Wiwa, has died of coronavirus at a London hospital.
Menegian was 50 at the time of his death.
Sister to the deceased, Noo, made the announcement in a Facebook post on Thursday.
She wrote, “We said goodbye to my brother, Gian, on Monday.
“He had COVID-19 combined with underlying health conditions.