Title: Carlton Lassiter
Content:  Detective Carlton Jebediah Lassiter MCJ is a fictitious character in the American sitcom Psych, played by Timothy Omundson.
Title: Carlton Lassiter
Content:  One of the main supporting characters of the detective comedy-drama show Psych, Lassiter is a ten-year veteran of the Santa Barbara Police Department, and the youngest Head Detective ever named to the force. He also has a Master's Degree in Criminology. He has a tense relationship with Shawn Spencer that often leads to exceedingly funny situations. According to Lassiter's blog, which is written by actor Timothy Omundson, he was a close friend of the former Santa Barbara police chief, who led him to enroll in the police academy during a "dangerous point" in Lassiter's youth. Upon his first appearance in the series pilot, Lassiter is said to be five 
Title: Psych (season 2)
Content:  Every cast member from the end of the first season returned, with one addition. James Roday continued to play fake psychic detective Shawn Spencer. Burton "Gus" Guster returned, portrayed by Dulé Hill. Timothy Omundson returned as Head Detective Carlton "Lassie" Lassiter, while Maggie Lawson continued to portray Juliet "Jules" O'Hara. Corbin Bernsen was kept on as Henry Spencer. This was the first season in which Kirsten Nelson received a star billing for her role as SBPD Interim Chief Karen Vick. Sage Brocklebank continued to portray Officer Buzz McNab, in 11 of the 16 episodes. Liam James was the sole actor portraying young Shawn 
Title: Psych (season 4)
Content:  James Roday continued to play fake psychic detective Shawn Spencer. Burton "Gus" Guster returned, portrayed by Dulé Hill. Timothy Omundson returned as Head Detective Carlton "Lassie" Lassiter, while Maggie Lawson continued to portray Juliet "Jules" O'Hara. Corbin Bernsen was kept on as Henry Spencer. Kirsten Nelson continued in her role as SBPD Chief Karen Vick. Sage Brocklebank continued to portray Officer Buzz McNab. Liam James and Carlos McCullers II continued in their roles as young Shawn and Gus, respectively. Rachael Leigh Cook appeared in four episodes as Abigail Lytar. Kurt Fuller made his Psych debut as Woody the Coroner, who shares many character 
Title: Psych (season 1)
Content:  Two actors received star billing for the first season, while three additional actors were considered part of the main cast. James Roday portrayed Shawn Spencer, a life-long slacker who uses his hyperobservant ability to claim he is a psychic. Dulé Hill plays Burton "Gus" Guster, a pharmaceutical salesman who is Shawn's best friend. Timothy Omundson portrays detective Carlton Lassiter, the level-headed lead detective for the Santa Barbara Police Department, and Maggie Lawson represents Juliet O'Hara, the department's naive junior detective. Shawn's father, Henry Spencer, a former police officer, is played by Corbin Bernsen and Karen Vick, the pregnant interim police chief is portrayed by Kirsten Nelson. By August 30, James Roday and Dulé Hill had been cast to play the show's main characters. The network also revealed that Corbin Bernsen had been cast as another of the show's major characters. On April 27, USA Network announced that Timothy Omundson and Kirsten Nelson would have starring roles in the episode.
Title: Psych (season 8)
Content:  James Roday continues to portray the fake psychic detective Shawn Spencer. Dulé Hill appears as Burton "Gus" Guster. Timothy Omundson and Maggie Lawson portray detectives Carlton "Lassie" Lassiter and Juliet "Jules" O'Hara, respectively. Corbin Bernsen continues as Henry Spencer, and Kirsten Nelson returns as SBPD Chief Karen Vick. Cary Elwes returned to portray the character of Pierre Despereaux for the fourth time in the series' run. He appeared alongside Vinnie Jones in the first episode of the season. Anthony Michael Hall reprises his role as Interim Chief Harris Trout, while Kristy Swanson, Kurt Fuller and Sage Brocklebank return as Marlowe Lassiter, Woody the Coroner and Buzz McNab, respectively. John Kapelos also returns as Tom Swaggerty, the Mayor of Santa Barbara, for the 
Title: Psych (season 3)
Content:  James Roday continued to play fake psychic detective Shawn Spencer. Burton "Gus" Guster returned, portrayed by Dulé Hill. Timothy Omundson returned as Head Detective Carlton "Lassie" Lassiter, while Maggie Lawson continued to portray Juliet "Jules" O'Hara. Corbin Bernsen was kept on as Henry Spencer. Kirsten Nelson continued to receive star billing as Karen Vick, while her character was promoted to permanent Chief of the SBPD. Sage Brocklebank continued in his role as Officer Buzz McNab in six episodes. Liam James portrayed young Shawn, while Carlos McCullers II continued to play young Gus. Cybill Shepherd joined the cast as Madeleine Spencer for three episodes. Rachael Leigh Cook also joined the show, as Abigail Lytar. Phylicia Rashad reprised 
Title: Psych: The Movie
Content:  Macchio joined the cast, reprising his role as Nick Conforth, the police academy officer who trained Shawn and Gus in season 5. Principal photography took place from May 25 to June 18 in Vancouver, British Columbia. In addition, Kurt Fuller and Jimmi Simpson reprised their respective roles of Woody Strode and Mary Lightly. The movie was released on December 7, 2017 on USA Network. Timothy Omundson returned as Carlton "Lassie" Lassiter but suffered a stroke just before shooting was to begin. The movie was partially rewritten, with Omundson appearing in only one scene that was filmed outside the main shoot in Vancouver months later.
Title: Psych
Content:  enjoys teasing lifelong friend Burton Guster (Gus), a pharmaceutical sales representative, about Gus's eclectic interests as they drive around in a blue Toyota Echo nicknamed "The Blueberry" solving crimes. Head detective Carlton Lassiter (Timothy Omundson), playfully nicknamed "Lassie" by Shawn and Gus, quietly respects Shawn's crime-solving skills, but doubts his psychic abilities and is constantly exasperated and/or infuriated by his antics. However, junior detective Juliet "Jules" O'Hara (Maggie Lawson) and Chief Vick (Kirsten Nelson) are far less antagonistic – with O'Hara expressing belief in Shawn's abilities, while Vick is mum on the subject – and usually willing to give Shawn the leeway he needs to solve cases. Henry and Shawn have a difficult relationship, but despite this, Henry reluctantly helps Shawn on various occasions.
Title: Psych: The Movie
Content: James Roday as Shawn Spencer ; Dulé Hill as Burton "Gus" Guster ; Timothy Omundson as Carlton "Lassie" Lassiter ; Maggie Lawson as Juliet "Jules" O'Hara ; Kirsten Nelson as Chief Karen Vick ; Corbin Bernsen as Henry Spencer ; Zachary Levi as Thin White Duke ; Ralph Macchio as Nick Conforth ; Jimmi Simpson as Mary Lightly ; Julianna Guill as Dr. Butterfly McMillan ; Jazmyn Simon as Selene ; Robert LaSardo as El Proveedor ; Kurt Fuller as Woody Strode ; Charlotte Flair as Heather Rockrear ; Sam Huntington as Sam Sloane ; John Cena as Ewan O'Hara ; Mena Suvari as Allison Cowley ; Sage Brocklebank as Buzz McNab ; Nathan Mitchell as Black Gentleman Ninja 

Question: who played carlton lassiter on psych?
Answer: Timothy Omundson.