I logged onto Facebook yesterday only to find:
Marcus Campbell Sinclair (1976-2020)
It is with much sadness that I must let you know that Marcus passed away yesterday. He courageously lived with his cancer for many years. Marcus was a unique and gifted person, who will be sorely missed.
Bad news. Much fun with Marcus over the years.
I learned from the comments on the post that he was Emperor Palpatine in the The Star Wars Exhibition at the County Hall, London back in 2007. I wish I could have told him how unimpressed Ben was with his throne (see Icons Passim). He would have laughed like a drain.