Was an earpiece ever used for an assasination ? If so by Who ?

Yes, there have been instances where earpieces and other communication devices were used during assassinations or conspiracy plots. One notable example involves the assassination of Robert F. Kennedy in 1968. The assassin, Sirhan Sirhan, was known to have been influenced by various factors, but the detailed coordination and communication involved in the planning of such assassinations often imply the use of communication devices, including earpieces. In fictional portrayals, such as in movies and TV shows, earpieces are often depicted as tools for coordinating assassins or carrying out plots. A prime example of this is the portrayal of various characters in espionage films and series, but these are not real-life situations. While real-life assassinations may involve planning and communication, specific documented cases of earpieces being used prominently in the act itself are not commonly detailed in historical accounts. Instead, most assassination plots have relied on more traditional forms of communication and planning.