McGee's guilt, Gibbs commented that McGee "doesn't know how to lie". His character was almost entirely altered by episode 6.12 "Caged", evolving into a bolder and more assertive character. Following Gibbs' brief retirement and Tony's subsequent promotion he becomes the senior field agent. He takes on the role very seriously, gaining Tony's respect. Tony later stops calling him "Probie" and starts calling him "Tim". He is shown to be very protective of his younger sister, Sarah, especially when she shows up after apparently committing a murder. He hides the case from his team to protect her while simultaneously launching an investigation into the case in the episode "Twisted Sister". Appearance Timothy McGee has green eyes and brownish-blond hair. He was overweight until the end of season 6; during the seventh season, he was shown to be losing weight. When DiNozzo pesters him about it, McGee replies that he has lost 15 pounds. McGee's weight loss led to speculation that Sean Murray, the actor who portrays McGee, was ill; in October 2010 Murray, via his Twitter account, explained that it was a deliberate weight loss via dieting, consuming only organic food and abstaining from alcohol and sugar. Murray has lost 25 pounds. In his initial appearances, McGee always wore a suit, dress shirt and a necktie. From season 4, he stopped wearing neckties and adopted a slightly more open-collar look. From season 7, he began frequently wearing leather jackets and bomber jackets over his shirt. For the first 14 seasons, McGee had a clean-shaven appearance; during his time being held hostage in Paraguay between seasons 14 and 15, he grew a beard, which he has since kept since his return to NCIS. Hobbies McGee has a passion for jet packs, computers and enjoys playing games relating to tactical warfare and covert infiltration. This is shown to be an interest shared by his sister Sarah in the episode "Red Cell", when she takes over his live war game as he leaves his apartment. In the episode "Broken Bird", his first computer was revealed to have been a Mac SE, followed by a PowerBook, and finally a PC. He uses a Logitech Y-SAE71-SK-2930 keyboard to carry out his everyday work. In the episode "Ignition", he discusses his fascination with jet packs, even going so far as to show Gibbs a film he has made about them (produced under his pen name "Thom E.