The contestant who died in a Nigerian reality television programme drowned taking part in one of its challenges, police have told the BBC.Anthony Ogadje, 25, died last Saturday during the filming of the first episode of the show in central Plateau State.Local police commissioner Charles Akaya said Mr Ogadje had been crossing a lake in a boat, when he fell in and drowned.The programme's sponsors have refused to say how Mr Ogadje died, as they are waiting for a post-mortem."They were in a canoe on the lake when an item that belonged to him fell into the water and he tried to retrieve it but fell overboard and drowned," Mr Akaya told the BBC News website.