Robert "Bob" Kirkland is a character who appears for the first time in Red Dawn.
He is a friend of FBI's Californian chief Alexa Shultz, and in Behind The Red Curtain, is revealed to be a possible accomplice of Red John or possibly Red John himself.
He probably has been pursuing the Red John's case since 2004.
In If It Bleeds, It Leads (5x07), Bob Kirkland identifies himself to Agent Lisbon as an agent for Homeland Security, that, usually, don't work on serial killers
. In episode 5x05 we take a look at the early beginnings of Patrick Jane and the CBI; towards the end of the episode, during a telephone conversation between Virgil Minelli and FBI Agent Alexa Shultz, a man is seen to be accompanying Shultz, as he seals the espionage deal. He said "Thank you" to Shultz, for the information on Red John's case (in background there's a musical theme, "Bloody Bed", a Red John's theme).
He's interested in Red John and involved in Lorelei Martins's case, but he doesn't said the motive for that the DHS, that usually works against terrorism and national security, is interested in Red John's case.
Robert Kirkland is a recurring character: in 5x07 episode, when he met and shook hands with Jane (with another and important Red John's music theme on background, the begin of "Your Worst Nightmare", the Red John Face's theme), and in Red Sails In The Sunset.
In this episode, with the help of Bret Stiles, Jane breaks Lorelei out of prison. Lisbon and Bob Kirkland think that Jane helped Lorelei, but after they find Jane's car with a broken window and his cellphone with the message: 'send one after me,' they suspect that Lorelei has Jane, in order to bring him to Red John or to take revenge.
Lisbon and Kirkland find out that Lorelei had a sister after a testy meeting with Dana Martins, Lorelei's mom, but she was killed and the killer was never found.
She says she does and faxes Jane the crime scene photo of the corpse of Miranda, Lorelei's sister, killed by Red John and the carved "Roy" (photo given to Lisbon by Bob). In the motel, Lorelei argues with Jane after finding out that he is pretending that she kidnapped him. Lorelei says "I only wonder why the two of you didn't become life-long friends the moment you shook hands." after Jane confronted her about Red John's connection to her sister's murder.
Lorelei leaves, with Jane' s permission, and Jane crashes their car to make it look like Lorelei kidnapped him, and took off. Lisbon arrives and Jane tells her Lorelei is on foot. In fact, she really took a car that was parked by the house.
At the end of the episode Jane tells Lisbon that Red John is someone he knows.
In There Will Be Blood, Kirkalnd once again shows interest in finding Lorelei Martins. So, Bertram gives Homeland Security full access to the investigation. Kirkalnd and Homeland appear at the crime scene at Jason Lennon's house, and he declares that it is under the jurisdiction of Homeland Security. He is also present at Lorlei Martins' murder scene.
Bob returned in Behind The Red Curtain. Kirkland kills Jason Lennon by injecting him with syringe containing just air that caused air embolus which lead his heart to stop. He asked Lennon if he recognized him. Lennon said no. And Kirkland said he was giving him a peaceful death. He tells Jane that Lennon died without saying a word.
In Red Letter Day, Kirkland makes two other Homeland Agents break into Jane's roof at CBI so they can gather all of Jane's insights on the Red John case. By the end of the episode, Jane realizes that someone broke in because he realized that the other half of his toothpick which he had left in between the door and the wall, was on the floor. Kirkland replicates Jane's bulletin board and he is seen examining it.
Due to his interest in Red John, along with the fact that Lorelei said RJ and Patrick had previously shook hands, many viewers believe Kirkland to be Red John or a close accomplice of him. He is on Jane's list of seven suspects.