The newer sections of the museum contain many exhibits from 20th-century crimes , notably the fake De Beers diamond from the Millennium Dome heist and Dennis Nilsen 's actual stove . The second room contains cabinets under the following categories Famous Murders , Notorious Poisoners , Murder of Police Officers , Royalty , Bank Robberies , Espionage , Sieges and Hostages and hijacking with real exhibits and details . On display is even the ricin-filled pellet that killed Bulgarian dissident Georgi Markov in 1978 . Also on display is a model of the possible umbrella that fired the pellet
Millennium Dome heist
Millennium Dome raid
Crime Museum