of friendship. He backed Don up to their superiors regarding Don taking the Crystal Hoyle kill-shot, which took place in "Two Daughters" and Ian referenced in conversation with Don in "Pandora's Box". It is heavily implied in "Two Daughters" and "Pandora's Box" that Ian used interrogation techniques, including physical force and borderline torture, to get information from a teenage accomplice of Crystal Hoyle. It is also implied that Don has seen or heard of Ian using such techniques before. Given that Ian's superiors were more concerned with discussing Don shooting Crystal Hoyle than Ian's borderline interrogation methods, it is likely that Ian will not be disciplined or will only be disciplined lightly over this incident. With the kill shot through the cab windows of a pickup truck, executed in "Pandora's Box," Ian hopes to be moved up to the third-best shot in the U.S. Edgerton did not appear in season four but returned in the premiere and finale for season five. At the end of the season five season finale, Ian goes on a date with Nikki Betancourt. During season six, Ian is accused of murdering one of his informants and taking money from a drug dealer that Ian had arrested years earlier. At the time, Don and the rest of the team struggle to believe Ian's innocence, especially after Ian takes Colby hostage. Eventually, they realize Ian's intentions and work to have him released from prison. Edgerton returned for the season six finale in a cameo appearance where he made an arrest and expressed disappointment that he was not invited to Charlie and Amita's wedding. According to Lou Diamond Phillips in an interview with TV Guide, Ian was supposed to be a closed-ended role. Members of the cast and crew wanted his character to return, so the writers expanded Ian's expertise. Since then, Phillips remains a cast and crew favorite. Lt. Gary Walker Lt. Walker (portrayed by Will Patton) is an officer of the Los Angeles Police Department, normally working on cases involving gang violence and organized crime. He is a hardened officer but has provided a great deal of help to Don's team whenever their paths cross. He appeared four times, beginning in Season 2 during the episode "The O.G.." In an interview with IGN.com's Travis Fickett, creator and executive producer Cheryl Heuton said that the cast and crew enjoy working with Patton. Heuton also stated that they