ByĀ MARK STEVENSON Updated [hour]:[minute] [AMPM] [timezone], [monthFull] [day], [year] Ā MEXICO CITY (AP) ā Bruno PlĆ”cido, a well-known leader of a civilian āself-defenseā group, was shot to death Tuesday in southern Mexico, eliminating one of the last true chiefs of the countryās armed vigiliante movements that sprang up a decade ago.Vigilante squads in other parts