John and Robert Kennedy Deadly Coincidences Lee Harvey Oswald Jack Ruby The C.I.A. Carlos Marcello Meyer Lansky Santo Trafficante J. Edgar Hoover Sam Giancana Jimmy Hoffa The Cubans Johnny Roselli Edwin Walker Clint Murchison Linden B Johnson Herminio Diaz Garcia Charles 'Dutz' Murret Richard Nixon Dave Yarras Guy Bannister James Files Allen Dulles Clay Shaw The Paines George De Mohrenshildt Charles Nicoletti Eugene Brading Lawrence Meyers H.L.Hunt Clem Sehrt Joe Civello Connections Map
J D Tippit
He may have known Jack Ruby, as Ruby had many friends and associates in the Dallas Police department.
Other underworld names, such as Joe Civello, and Joseph Campisi might also have been known to him.
However, with several credible witnesses balanced against an interesting, yet unsubstantiated web of coincidences, the conspiracies carry a weak argument for Tippit having any involvement in the assassination of the President.