Malcolm David Kelley (born May 12, 1992), sometimes credited as just Malcolm Kelley, is an American rapper, singer, songwriter and actor best known for portraying the character Walt Lloyd on the ABC series Lost and as one half of the pop duo MKTO.
Kelley's first major acting role was in the 2002 film Antwone Fisher, in which he played the title character as a child. Prior to this, he appeared in several small television roles in programs such as Malcolm in the Middle and Judging Amy. His next film role was You Got Served, in which he was cast in the supporting role of Lil' Saint.
In 2004, he was cast to play Walt in the TV show Lost. A regular cast member in the show's first season (2004–2005), he appeared only occasionally thereafter due to a dramatic growth spurt. He returned for an appearance in "Through the Looking Glass", Lost's third season finale, and twice more in the fourth season, with the episodes "Meet Kevin Johnson" and "There's No Place Like Home", and reprised his role in the fifth season with the episode "The Life and Death of Jeremy Bentham". He reprised the role of Walt a final time in the Season 6 DVD box set mini-episode "The New Man in Charge".

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