Andy Warhol’s famous painting of Marilyn Monroe sold for $195m at auction, making it the most expensive piece of artwork by a US artist ever and the most expensive piece of 20th Century art ever sold. The 1964 silk-screen portrait of the American actress, titled Shot Sage Blue Marilyn, is one of several paintings Warhol made of Monroe following her death due to a barbiturate overdose in 1962, and has since become one of the...