NCIS: Los Angeles will delve into Deeks' past in season 6.

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Like all of the Los Angeles agents, Marty Deeks' (Eric Christian Olsen) childhood is a bit of a mystery. It is known, however, that an 11-year-old Deeks shot his father in self-defense, and the implications of that day will resurface when the Detective's childhood friend makes a reappearance.

Ray (Channon Roe), the boy from whom Deeks first acquired a gun, appeared in season 2, and the criminal will be back later this season.

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"Deeks has spent kind of his whole life running from his dad and what his dad represents in his life," Olsen explained to TV Guide. "Every time Ray comes back, he's confronted with not only Ray but with the person that he could have been if he would have continued the cycle that his father kind of instilled in him."

Unfortunately for Deeks, he will have to play the very version of himself he so narrowly escaped when resumes his alias as Max gentry.

"Max is an interesting and dark place for Deeks to go, and I think that - like all [aliases] - is a version of himself that he decided not to be," Olsen told TV Guide. "It's a little too real and taps a little bit too deeply and honestly into his own childhood."

Find out how the Ray/Deeks storyline plays out when NCIS: LA airs Mondays at 10 p.m. ET on CBS. Click the video below to see a preview of the series' next episode, "Praesidium."

Tags: NCIS: LA NCIS: Los Angeles television CBS