|Significant other(s):||Juliet O'Hara (formerly)|
|First appearance:||Shawn 2.0|
|Last appearance:||One, Maybe Two, Ways Out|
In "Shawn 2.0", Declan keeps stealing Shawn's thunder and eventually piggybacks on his case after revealing that he is a criminal profiler. Along the way, he begins to successfully woo Juliet, much to Shawn's disappointment. Gus soon dubs Declan "Shawn 2.0." When Shawn figures out that Declan is a fake, Declan eventually confesses to Juliet that he is not a real criminal profiler, and then proceeds to ask her out in front of Shawn. Juliet is impressed by Declan's humility, and accepts.
One, Maybe Two, Ways OutEdit
In "One, Maybe Two, Ways Out", Shawn is forced to ask for Declan's help in order to utilize his helicopter to track a suspect. Declan further annoys Shawn by insisting on confessing his involvement in the case to Juliet.
Extradition II: The Actual Extradition PartEdit
In "Extradition II: The Actual Extradition Part", Juliet reveals to Shawn that she has broken up with Declan, but does not tell him why. Later on in the episode, it becomes apparent the she broke up with him because of her attraction to Shawn, which she never fully lost.
- Declan is the only person other than Henry, Juliet, and Gus that knows Shawn isn't a real psychic until the series finale.
- Declan is no longer called on to help the SBPD after he reveals that he is a fake, however, this does not bother him much, since he was only helping them as a hobby, and not as an actual job. He also leaves the detective work to Shawn Spencer as a "psychic detective" for the SBPD.
- Declan has essentially vanished without a trace since Season Five.