Tecnica Di Un Omicidio (1966)

aka’s: Technique D’un Meurtre/
The Hired Killer/No Tears For A Killer/
Professional Killer

Hit-man Clint Harris (Robert Webber) has one more job to do before he can retire. The corporation that hires him demands that Harris “erase” an ex-employee who has become a snitch for the police. At first Harris refuses but when his own brother is assassinated he accepts the job. Also stars Franco Nero and José Luis de Vilallonga. And with Kitty Swan (uncredited).