George Ash.  Beaten and shot December 1964

This is George Ashe with two of his attorneys in 1959, Joe Oteri, left and Monroe Inker, right. Ashe was a small-timer, and was released from state prison in 1964 right into the middle of the Irish Gang War. The feds managed to recruit him as an informant in December 1964, but somehow he ran afoul of Jimmy the Bear Flemmi, the younger brother of Stevie Flemmi, Whitey Bulger's partner-in-crime.
 

Brief FBI report on Jimmy the Bear's murder of Ashe (whose name is redacted)

Mention of Ashe's death in 2003 report of the House Committee on Government Reform, (Again, he is unnamed.)
 

Police and cameramen hovering around Ashe's death car, Dec. 1964.
 

And what is the significance of all this? It is the fact that although the FBI knew that Jimmy the Bear had murdered one of their informants, three months later, in March 1965, they still recruited Flemmi as an informant. Two days later, along with Joe Barboza the Bear murdered another hood, and again the FBI knew he did it, but rather than lose their prized informant, they let it slide. And in 1968, when they flipped Barboza, the FBI let him commit perjury in a first-degree murder trial and send four innocent men to prison for life, all to protect himself and his pal Jimmy the Bear.