After a confidential police lead ends up in one of Hill's articles, Lt.
María La Guerta (Lauren Vélez) warns Quinn to be wary of any reporter who squeezes him for confidential information over pillow talk.
In season four, Quinn bears a grudge against Dexter Morgan (Michael C.
Hall) for botching the blood work for a case he worked on.
Quinn first appears in the season opener, "Our Father", in which he is partnered with Debra Morgan (Jennifer Carpenter).
He takes a liking to her, even helping her with a case by giving her one of his confidential informants.
Though more careful about what he says around her, Quinn still defends Hill when Dexter tells her to leave Debra alone, as Hill wanted to do a piece on her about a shooting she was involved in.
Quinn denounces Hill after it is revealed that she is the Trinity Killer's daughter and had been manipulating him to keep her father from being arrested.
Quinn breaks up with Hill after she publishes the article about Lundy, but the two soon get back together.
However, after Dexter sees Quinn taking money from a crime scene, he tries to shut him up by buying him expensive football tickets.
Meanwhile, Quinn starts a relationship with Christine Hill (Courtney Ford), a reporter who flirtatiously grills him for information on his cases.
Following the fact that Dexter was part of the raid during Rita's time of death, he begins to focus on the composite sketches of "Kyle Butler" and determines it to be Dexter.
After tracking down Mitchell's son Jonah (Brando Eaton), who was due to enter witness protection, he attempts to have him identify Dexter as Butler, but is caught by marshals and suspended.