So I was originally intrigued by this because Wallace was from my hometown (Mt Pleasant). As I looked closer into it, i found out we share a common surname (Riddle)- so I am looking into that. It's amazing that growing up here , i have never heard of this dude.
Wikipedia, so take it for what it is...
In 1984, Billie Sol Estes told a grand jury investigating the 1961 shooting death of Henry Marshall, an official with the Department of Agriculture, that Wallace was his murderer.[1] Estes, who was convicted in 1963 on federal charges related to non-existent fertilizer businesses, said that Marshall possessed information linking Estes' fraudulent schemes to a heavily-funded political slush fund run by Lyndon B. Johnson.[1] According to Estes, he and Johnson discussed the need to stop Marshall from making their illegal ties public.[1] In exchange for immunity from prosecution, Estes was also prepared to provide the United States Department of Justice information of eight killings orchestrated by Johnson, including the assassination of John F. Kennedy.[5] He claimed that Wallace persuaded Jack Ruby to recruit Lee Harvey Oswald and that Wallace fired a shot that struck Kennedy.[5]
Glen Sample and Mark Collom implicated Wallace in a conspiracy to assassinate Kennedy in their mid-1990s book The Men on the Sixth Floor.[6] According to the authors, Collom met Loy Factor while confined in a hospital isolation ward in 1971 where Factor implicated himself, Wallace, and a woman named "Ruth Ann" in the assassination of Kennedy.[6] Conspiracy debunker Dave Perry charged the authors of relying upon unreliable witnesses, including Foy, Estes, and Madeleine Duncan Brown.[7]
Barr McClellan, author of Blood, Money & Power: How LBJ Killed JFK, reiterated many of Estes claims in 2003 stating that Johnson, Wallace, Estes, and Cliff Carter were responsible for the death of Marshall.[8] According to McClellan, Wallace fired one shot at Kennedy from the sixth floor of the Texas School Book Depository, then ran to escape.[8] He stated that fingerprints and an eyewitness placed Wallace in that location and that Wallace could be seen as a "shadowy figure" in photos of the building.[8]
Roger Stone, author of the 2013 book The Man Who Killed Kennedy: The Case Against LBJ, called Wallace "Lyndon Johnson's personal hit man" and also said that Wallace shot Kennedy from the sixth floor of the Texas School Book Depository.[9] Similar to McClellan's account, Stone said six eyewitnesses placed Wallace in that location and that a fingerprint found on a box in the sniper's nest was his.[9]
https://en.m.wikipedia.org/wiki/Malcolm_WallaceI also found this as well..::
Alan, a very clear account of the Mac Wallace fingerprint evidence. Is Nathan Darby the only fingerprint expert to conclude that this is a clear match? It would definitely help if other experts in this field came to the same conclusion.
"My problem with this fingerprint evidence is that it suggests that Mac Wallace was one of the gunmen involved in the assassination. This evidence has been used to suggest that Lyndon Johnson was involved in the conspiracy to kill JFK. It has been pointed out that on 22nd October, 1951, Wallace shot dead John Kinser, the owner of a golf course in Austin. Wallace and Kinser were both having an affair with LBJ's sister, Josefa Johnson. According to Barr McClellan, Kinser was blackmailing LBJ. McClellan claims that the killing was organized by Ed Clark on behalf of LBJ. Billie Sol Estes has also claimed that LBJ was involved in the death of Kinser.
At his trial in February, 1952, Wallace was found guilty of murder. Eleven of the jurors were for the death penalty. The twelfth argued for life imprisonment. The judge overruled the jury and announced a sentence of five years imprisonment. He suspended the sentence and Wallace was freed. Someone very powerful was obviously helping Wallace. It is indeed possible that LBJ was the person who put pressure on the judge to release Wallace. According to McClellan, LBJ arranged for Wallace to obtain a job with the Luscombe Aircraft Corporation. This became part of Ling-Tempco-Vought ( LTV), a conglomerate funded by Clark's clients in the oil industry. "
http://educationforum.ipbhost.com/index.php?showtopic=4966That Page also has a lot of Information on the fingerprint they believe to be his found at the school depository.