Originally from Louisiana, Sinqua moved to Los Angeles with his family and attended El Segundo High School. Growing up he played a variety of Sports, but spent much of his childhood learning plays and studying his favorite movies, and would always watch his favorite movies until he could remember every line as practice for a Future movie career. He knew that acting is what he wanted to do since he was eleven years old after watching "The Radio Flyer," which is also the first movie he memorized from start to finish. In 2007, he attended and graduated from University of San Francisco's art program where he studied Theatre and Film.
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.
