86.543. If any member of the police department of any suchcity, who shall have served faithfully twenty years and less thantwenty-five years in such department of which the last six yearsshall be continuous, be removed, suspended or discharged fromsuch department, or become or be found upon examination by amedical officer selected by such board and authorized by saidapplicant to be superannuated, by age, permanently insane ormentally incapacitated or disabled physically or mentally so asto be unfitted or unable to perform full police duty by reason ofsuch disability or disease so as to render necessary hisretirement from service in such department, if the said board oftrustees find such incapacity does not result from misconduct onthe part of such member, it shall pay to the said member fromsaid pension fund, a sum equal to four-fifths of one-half theaverage monthly rate of salary which such member shall havereceived on said force during three years immediately precedingthe date of his retirement. After the decease of such member,his wife while single, and children under sixteen years of age,if any survive him, shall be entitled to the pension provided forin sections 86.510 to 86.577.
(RSMo 1939 ยง 9484)