Pedro Gutierrez Valencia wrote a letter to President Johnson on December 2, 1963. Gutierrez, a Mexican credit examiner, told Johnson in this letter that he had bumped into a Cuban man accompanying Lee Harvey Oswald around October 1, 1963, and that the Cuban had been counting out money for Oswald. Gutierrez' letter and subsequent FBI investigations (reported to the Warren Commission in CE 2121) was among the stories which helped form the "Cuban conspiracy" theory pushed by Ambassador Mann and CIA officials in Mexico.

However, in this HSCA interview conducted on June 5, 1978, Gutierrez denied several key aspects of what is supposed to be his own story. He told HSCA investigators that Oswald was alone when Gutierrez bumped into him. He said he could not have described the Cuban as that man was in a car far away and he barely caught a glimpse of him. Oswald was never handed money by this Cuban, in any case, and Gutierrez denied that he had heard any heated discussion concerning Kennedy. Gutierrez also disputed several lesser aspects of the FBI reports, including who the credit examination he was conducting was for and its subsequent disposition, and whether he followed Oswald. When HSCA investigator Edwin Lopez summarized the contents of the Gutierrez letter to its author, and then asked if Gutierrez remembered writing the letter, the reply was "Yes, I do, but I don't remember writing all those things that you just told me about."