Would that have been at 'The Global Village' near Charing Cross? I saw something similar but I think it might have been a bit later than 1970. The guy was lying flat out with his girlfriend beside him and I don't think he had any mates with him. They turned the music off and we all had to leave the club. We heard he was already dead but not sure if it was true. Don't know if they caught who did it.There always seemed to be trouble at that place because East London/Essex would travel in on the District Line and South/ South-East London/Kent travelled up on BR Trains. Danny Baker the DJ from South London has talked about going there. Luckily the Bouncers were twice the size of most of us and they kept trouble to a minimum, but it was a place where you had to watch your back.
The Club I was at,was "Reflections" in the Piccadilly.A gang of Blacks from South of the River( they called themselves the "Kingston Trilbies)started trouble.The Fella was on the Dancefloor,when one of the Blacks took a shine to his Girlfriend.Next minute,his Face etc. was carved open ,we heard from the old Bill(later),he died in Hospital.Needless to say the Gang had long gone by then.