Detective Carlton Jebediah "Lassie" Lassiter MCJ is a fictional character in the American sitcom Psych and the sequel film series of the same name, played by Timothy Omundson.

Eventually, Lassiter's wife asks him to dinner, something he thinks points to reconciliation for them, but in truth, she simply wants to give him divorce papers.

After meeting Shawn and Gus, she is impressed by their methods and decides to film them instead, which irritates Lassiter.

In the episode "High Noon(ish)" it is said that Lassiter's mother never had time to take care of him and dropped him off at Old Sonora, a tourist Western town, every weekend.

Additionally, it is revealed in the episode "Weekend Warriors" that Lassiter is an avid Civil War buff who actively participates in reenactments.

In the fifth season episode "Not Even Close... Encounters" it is shown that Lassiter has a physical "crap list" from which he removes Shawn's dad Henry.

Marlowe is wrapped up in the criminal plot of the episode, and is sent to jail; however, Lassiter touchingly gives her a note stating that he will wait for her for the six to eighteen months that she is in prison.

The separation (and the strain on Marlowe's roommates) becomes insufferable and the two announce their intent to marry, which they do in the next episode.

"[6] However, over time he has developed a grudging respect for Shawn's investigation skills, something he admits in one episode only after becoming intoxicated.

[7] Omundson describes his character's animosity towards Shawn as stemming from the fact that Lassiter has worked hard to climb the chain of command and become good at his job.

Lassiter prides himself on his sternness and professionalism but is frequently shocked to discover that his peers, colleagues, and (occasionally) suspects do not hold him in equally high regard.

He also hints at being a Republican when he says he believes that there is no room for interpretation in the Constitution and through his admiration of both Chuck Norris and the NRA.

Additionally, in the seventh season episode "Deez Nups", he refers to having been busy "opposing the healthcare law at the grassroots level," presumably a reference to the Affordable Care Act that had recently been implemented despite considerable opposition from the Republican Party.

Even so, Omundson notes that Lassiter's appreciation for his rivalry with Shawn and Gus outweighs their interference and his misgivings stating, "I think, secretly, he doesn't mind them too much because it always gives him a nice challenge.