The phrase "retired policeman" refers to someone who used to work as a police officer but has now stopped working and is no longer on active duty. Full definition
Crazy with rage and thirsty for vengeance she demands the head of the murderers from Julian; but first, Julian must confront Chang (Vithaya Pansringarm), a mysterious retired policeman — and figurehead of a divine justice. (trespassmag.com)
Jacob Rees - Mogg, MP for North East Somerset, told the Sun: «I'm deeply concerned that as far as I can tell the reason for his resignation is some questionable behaviour by retired policemen based on a deeply questionable search of his office when he was an opposition spokesman in 2008.» (theguardian.com)
Marnie indulges in a romance with retired policeman Randy Zipper (J.K. Simmons), warming up to him in a pair of motorcycle rides but at the same time meets an advance by another suitor who had given her a lift home by punching him several times in the stomach and head. (shockya.com)