Question: Work Out featured which army ranger and fitness model in its fourth season?
Context: George Gregory Plitt, Jr. (November 3, 1977 – January 17, 2015) was an American fitness model, actor and former Army Ranger.  He starred in the Bravo television series "Work Out."  He died at age 37 when he was struck by a train locomotive while filming a video. Ahmo Kathleen Hight (born September 18, 1973) is an American fitness model, swimsuit model and actress.  She first rose to prominence in winning the Ms. Fitness USA (Western States Division) tournament and Ms. Fit Body Bay Area in 1994, after which she began modeling for fitness and muscle magazines.  In 1997, she launched an acting career (sometimes using the name Amy Hite) and appeared in several made-for-video and made-for cable films, mostly of softcore porn genre.  She also appeared in videos produced by "Playboy" magazine.  She appeared opposite Anna Nicole Smith in the faux documentary "Anna Nicole Smith Exposed", as well as episodes of the television series "Pacific Blue" and "Hotel Exotica". The Ranger Creed is the official mission statement of the United States Army Rangers.  The Ranger Creed was written in 1974 by CSM Neal R. Gentry, the original command sergeant major of the reactivated 1st Ranger Battalion.  It was initiated by the Battalion Commander, then-LTC Kenneth C. Leuer, and re-drafted by the battalion XO, MAJ "Rock" Hudson and finalized at Fort Stewart, Georgia in 1974 when the original cadre deployed there on 1 July 1974.  Today, members of Ranger community recite the Ranger Creed during formations, ceremonies, physical training activities and upon graduations from the Ranger Indoctrination Program, the Ranger Orientation Program and the U.S. Army Ranger Course. Work Out in the Zone (previously known as Work Out) is an American reality television series on Bravo, which premiered on July 19, 2006.  The show is centered on fitness trainers and models located in the many cities of California.  The first three seasons featured many of the trainers who work for fitness trainer Jackie Warner, and some other aspects of the gym and its clients as well as Warner's other fitness ventures, and private life.  The third season of "Work Out" ended on June 10, 2008, and was subsequently canceled.  A fourth season is currently held in production, with eight different trainers cast for the show.  Warner, will not return for the fourth season, after the network was not pleased with her interaction with the other trainers.  The fourth season, which revamped the show's concept, mainly featured top fitness model and former army ranger Greg Plitt, who was the only cast member to return from the previous season. Kasbani Bin Kasmon Singapore-born fitness personality (born 14 April 1989), better known by his nickname, Que Andrea Kasbani, is a fitness model and a cover model who has been featured in various magazines such as the Manja Magazine (Singapore), Mangga (Malaysia), Maskulin Magazine (Malaysia), REPS Magazine (Indonesia), Cosmopolitan Magazine (Singapore), SUTRA Magazine (Singapore) and Ifitness Magazine (Singapore) as well as on the fitness sutra website.  Apart from modeling, Kasbani is also a freelance actor and has been featured on show such as BlogTv on ChannelNewsAsia and on Suria. Ingrid Romero (born July 10, 1985) is an international fitness model, fitness competitor, and fitness coach.  Training & Fitness Magazine called her "one of the most recognized faces in the fitness industry," and "one of the most accomplished female fitness stars ever." The Eighth Army Ranger Company, also known as the 8213th Army Unit, was a Ranger light infantry company of the United States Army that was active during the Korean War.  As a small special forces unit, it specialized in irregular warfare.  Intended to combat the North Korean (NK) commandos who had been effective at infiltration and disruption behind United Nations (UN) lines, the Eighth Army Ranger Company was formed at the height of the Battle of Pusan Perimeter in September 1950 and was the first U.S. Army Ranger unit created since World War II.  The company went into action as a part of the 25th Infantry Division during the UN advance into North Korea in October and November.  It was best known for its defense of Hill 205 against an overwhelming Chinese attack during the Battle of the Ch'ongch'on River which resulted 41 of the 51 Rangers becoming casualties. Vanda Maria Hădărean (born May 3, 1976 in Cluj-Napoca, Romania) is a retired Romanian artistic gymnast who competed in international events between 1990 and 1993.  She is an Olympic silver medalist and a world bronze medalist with the team and a European all around bronze medalist.  She is also a successful fitness model and she has won various world class fitness competitions.  She is a four-time Ms. Fitness World (2008, 2009, 2010 and 2011) and a four-time Ms. Fitness Canada (2006–2009).  She also coaches, trains, provides consultation services to gymnasts and fitness models under the brand name “Inspired by Vanda”.  She is also known for her breakout photo series in the Romanian Playboy magazine. The United States Army Rangers are an elite rapid-deployment military formation of the United States Army, that serve in designated U.S. Army Ranger units or are graduates from the U.S. Army Ranger School.  The term "ranger" has been in use unofficially in a military context since the early 17th century.  The first military company officially commissioned as rangers were English soldiers fighting in King Philip's War (1676) and from there the term came into common official use in the French and Indian Wars.  There have been American military companies officially called "Rangers" since the American Revolution. Roger Snipes (born February 5th, 1979) is a British bodybuilder, Fitness model, fitness competitor and fitness trainer.  He is winner of Mr. UK, Mr. Britannia in 2010 and Fame UK in 2011.  He followed it up with a win at Musclemania 2011.  He won the WBFF European Championship in 2013 and took second place in the WBFF World Championship 2015.  He has been a Shredz, PhD athlete and WBFF Pro Muscle Model.
Answer: George Gregory Plitt, Jr.