accessory after the fact

/AE0 K S EH1 S ER0 IY0 AE1 F T ER0 DH AH0 F AE1 K T/
noun
  1. 1

    A person who assists or protects someone wanted by the police in connection with a crime.

Source: https://en.wiktionary.org/wiki/accessory%20after%20the%20fact