Caravaggio murdered by the Knights of Malta?

[The Telegraph, UK]  His mysterious death at the age of 38 has been blamed variously on malaria, an intestinal infection, lead poisoning from the oil paints he used or a violent brawl. Now an intriguing new theory has been put forward for the demise of the rabble-rousing Renaissance artist Caravaggio – that he was killed in cold blood on the orders of the Knights of Malta to avenge an attack on one of their members