In events that sparked decades of fascination, Lucan went on the run in 1974 after Sandra Rivett, 29, was found murdered with a lead pipe in her employer’s London home. His wife, Veronica, survived a similar attack the same night. Cluedo cards found by police at the time included Colonel Mustard, the lead pipe and the hall, according to the Daily Mail. All three were missing from the set Lucan had. Three Cluedo cards appear to represent Sandra Rivett’s murder and have sparked new questions about whether her death was planned ALAMY The Mail also revealed an unseen photo of Lucan said to resemble Colonel Mustard, also ex