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He is 5' 7" (1.70 m).
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He appeared with Prison Break co-star Robert Knepper in the movie Hostage. They haven't made scenes together on the TV show.
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He has a brother named David.
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Marshall studied acting at Playhouse West in Los Angeles.
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In 2003 he appeared in Malcom in the Middle as Dylan.
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Marshall married Jamie Brown in June 2006, in Austin, Texas.
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He likes to watch martial arts
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He likes to eat pan pizzas
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He would like to do sky diving .
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He likes to eat tuna fish.
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For some time he was considering to do modeling.
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He likes to play mini golf
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He likes to sleep a lot.
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He likes blonde girls.
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He likes to play racing games on playstation.
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He likes to eat a lot of snacks
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His lucky number is 7.
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He drinks about 3 bottles of energy drinks a day.
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Marshall actively supports programs that provide art and music education to young people.
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He knows how to read and write in Spanish.
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He likes to play baseball.
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He likes to read comics.
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He likes to ride bikes.
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His favorite cartoon is The Simpsons.
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As of 2006, he is learning Spanish.
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He likes Italian food.
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He doesn't like tatoos.
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He always wanted to go to Yale.
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He collects model submarines and watches
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He likes surfing on the web.
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His friends used to call him T.J.
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He really likes electronic gadgets.
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At the age of 7 he broke his leg.
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One of his dreams was that of becoming a doctor.
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He enjoys spending time with children.
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He also studies guitar and piano, writes poetry, and is finishing a screenplay. (from the The Osbrink Agency)