Did Cuba Have Gilberto Policarpo Lopez Help Lee Harvey Oswald Assassinate President John F. Kennedy?

It's been highly debated for many years if the Cuban government had a role in the assassination of President John F. Kennedy. At the time of Kennedy's death and unbeknownst to John and Robert Kennedy, the CIA was plotting with a high-level Cuban official, code-named AMLASH, to assassinate Fidel Castro as well as Chicago mobster Johnny Roselli and Rolando Cubela. 

In 1967 President Johnson had ordered an internal CIA investigation after claims that Castro had known of the CIA's plot and had dispatched "teams" to retaliate. 

Castro gave Associated Press reporter Daniel Harker an unusual, impromptu, three-hour interview in which he warned against U.S. support of terrorist plans to eliminate Cuban leaders.

Gilberto Policarpo Lopez was born in Cuba. He left in 1960 to avoid being drafted into the military and eventually became a US citizen. During the last week of JFK's life, Lopez shadowed the president in Tampa. There, he waited for an important call from Cuba, giving him the “go-ahead order” to return. When the call never came, Lopez departed that November 18th or 19th, 1963 for Texas. Just days later, JFK flew few to Texas, where he was assassinated on November 22. At midnight on the same day JFK was killed, Lopez showed up at the Mexican border made his way to Mexico City. 

The CIA flagged Lopez as a possible suspect in the assassination plot.

Just one month earlier, on October 8th, Oswald had also traveled to the Mexican capital from New Orleans. While there, Oswald visited both the Soviet and Cuban diplomatic establishments. Oswald had applied for a visa, but it was subsequently denied. 

In Mexico City, Lopez apparently obtained a “Cuban courtesy” visa. On November 27th, he hopped on a Cubana Airlines flight to Havana, where Lopez was the only passenger.