Boken and Bo staffs have been used to kill in history- past 20 years in various parts of world the 'Big stick' has been used to kill at times, sometimes when crippling blow was intended and that has been recorded, noticed on internet. Couple Japanese security or police officers thumped attacker or robber with knife- result was dead criminal, some investigation of officer for possible misconduct, regular procedure for death by officer. London in UK and couple other cities- canes and walking sticks, 'Martial arts staff' deaths noted , public record. USA records have self defense deaths - pistols used, rifle used, ball peen hammer used, cane or club, staff sometimes noted. FBI records will have them listed as 'blunt instrument/Club/staff/stick/bat/other.