Ted Dealey was a close associate of George de Mohrenschildt and David Harold Byrd via the "Texas Crusade For Freedom":
George de Mohrenschildt moved to Dallas in 1952, established himself as a consulting geologist, and was quickly accepted into the city’s ruling elite. He joined the powerful Dallas Petroleum Club and became a regular at Council on World Affairs meetings. Many of the figures involved in those two entities also showed up on the boards of other influential local groups. One was the Texas chapter of the Crusade for Freedom, a private conduit for laundered money to be sent to “freedom fighters.”
Members of the Texas Crusade for Freedom would become a who’s who of Texans connected to the events surrounding the assassination of John F. Kennedy. In addition to Neil Mallon, members included Raigorodsky, MacNaughton, Everett DeGolyer and Dallas mayor Earle Cabell, brother of Charles Cabell, who was Allen Dulles’s deputy CIA director. Another member was D. Harold Byrd, who owned the building in downtown Dallas that would become known as the Texas School Book Depository. Still another was E. M. “Ted” Dealey, publisher of the Dallas Morning News, who was a harsh critic of Kennedy.
[from Russ Baker's article "Bush and the JFK Hit"]
One of the most bizarre elements of the whole JFK assassination case is the supposed friendship between De Morenschildt and Oswald.