From the link I posted at #236:
"Malcolm Wallace, convicted in a 1951 murder and suspected in others, has been linked to the 1961 death of U.S. Department of Agriculture investigator Henry Marshall. Marshall was reportedly close to connecting Lyndon Johnson to fraudulent activities involving businessman and convicted swindler Billy Sol Estes.
"Estes alleged in 1984 that LBJ ordered the killings of Marshall, President Kennedy, and half a dozen others, and that Wallace carried them out. A grand jury decided that same year that Henry Marshall was murdered as a result of a conspiracy involving then-Vice President Johnson, his aide Clifton Carter, and Wallace. No charges were possible since all three men were by then deceased."