Chicago PD 4×15 “Favor, Affection, Malice or Ill-Will” Season 4 Episode 15 Promo – When Lindsay (Sophia Bush) is tipped off about a grieving father looking to avenge his daughter’s death, Olinsky (Elias Koteas) goes undercover as a hitman-for-hire. With Gang Intelligence lacking enough evidence to arrest the original gangbanger in question, the team works to reinvestigate the case. Meanwhile, Ruzek (Patrick John Flueger) comes back after finishing his undercover assignment only to have Voight (Jason Beghe) knock him down to patrol duty. Also starring Jesse Lee Soffer, Marina Squerciati, LaRoyce Hawkins and Amy Morton. Guest starring Carl Weathers, Yuri Sardarov and Nick Wechsler.