Originally from Louisiana, Sinqua moved to Marina del Rey, California, with his family and attended El Segundo High School. Walls became interested in acting as a child after watching Radio Flyer. In 2007, he graduated from University of San Francisco, where he studied theatre and film.[citation needed] During college, Walls played on the San Francisco Dons men's basketball team.
Walls played Boyd, a beta werewolf who was a formerly recurring character on the MTV drama series Teen Wolf. He has also made appearances on Pair of Kings, Lincoln Heights, Friday Night Lights, Grey's Anatomy, Blue Mountain State, The Secret Life of the American Teenager, Necessary Roughness, and on MTV's Next.
He starred in the 2011 horror feature Shark Night 3D. Walls played a guest role on the second season of the ABC fantasy series Once Upon a Time, as Sir Lancelot. He returned to the show during the fifth season as a guest star. He played the role of Shawn in the TV series Power. On August 1, 2017, Walls was cast in Clint Eastwood's biopic The 15:17 to Paris, about the thwarted 2015 Thalys train attack. The film premiered on February 9, 2018.

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