|Favor, Affection, Malice or Ill-Will|
|Season 4, Episode 15|
|Airdate||February 22, 2017|
|Written by||Craig Gore & Tim Walsh|
|Directed by||Holly Dale|
Favor, Affection, Malice or Ill-Will is the fifteenth episode of the forth season and the 76th overall episode of Chicago P.D.
When Lindsay is tipped off about a grieving father looking to avenge his daughter's death, Olinsky 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 comes back after finishing his undercover assignment only to have Voight knock him down to patrol duty.
- Jason Beghe as Sergeant Hank Voight
- Jon Seda as Detective Antonio Dawson
- Sophia Bush as Detective Erin lindsay
- Jesse Lee Soffer as Detective Jay Halstead
- Patrick John Flueger as Officer Adam Ruzek
- Marina Squerciati as Officer Kim Burgess
- LaRoyce Hawkins as Officer Kevin Atwater
- Elias Koteas as Detective Alvin Olinsky
- Amy Morton as Desk Sergeant Trudy Platt
- Bruce Altman as Donald Clark
- Tom Pelphrey as Thomas "Scrap" Cade
- Saul Stein as Detective Arnold Chilewich
- Edwin Walker as Omar Fry
- Adam Soule as Thomas Kade / Josh Tucker
- Barret Walz as ATF Supervisor Geg Hammet
- Karl Iglesias as Maxwell "Goldfish" Clay
- Brennan Roche as Jeremy Reynolds
- Klarke Gill as Violet Fry
- Chase Penny as Store Manager
Olinsky: Donald Clark. Why don't we let him loose?
Voight: He solicited a murder, Al.
Olinsky: Not like we haven't done worse.
Burgess: Him coming back? It sounds like Voight just shut the door on that.
Rixton: Yeah, but where do you stand on that?
Burgess: You've been great, Kenny. A real asset.
Omar: Running like he was just shooting. And I know what that looks like.
Olinsky: Just so we understand each other, once you start this, there's no turning back.
Voight: He's back at 21, yeah, but he's not back up here.
Voight: She'd only been in Chicago six months when she got killed.
Ruzek: No sweat, man. Just keep doing the job.
Ruzek: My ex-fiancee was coming upstairs. I freaked out a little bit.