"1952-12-12Z"^^ . . "Cook, Billy"@en . . "1928-12-23Z"^^ . "Billy Cook"@en . . "American mass murderer" . "1952Z"^^ . "1928Z"^^ . "William Edward \"Billy\" Cook (December 23, 1928 \u2013 December 12, 1952) was an American spree killer who murdered six people on a 22-day rampage between Missouri and California in 1950\u201351."@en . .