Originally from Louisiana, Sinqua moved to Los Angeles with his family and attended Beverly Hills 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. Walls is well known for playing Beta werewolf Boyd, a formerly recurring character on the MTV drama series Teen Wolf. He has also made notable 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 played a role of Shawn in the TV series Power. In 2015, it was revealed that Walls will return as Sir Lancelot as a guest star on the fifth season of Once Upon a Time.
- His Portrayal of "Sir Lancelot" on ABC'S" Once Upon a Time" is one of the few performances of the iconic character portrayed by a Black American on Television and Film.
- Performed all of his own basketball stunts in his role as Devon Langer on USA'S "Necessary Roughness".
|Lincoln Heights||Desmond||2 episodes|
|Friday Night Lights||Jamarcus Hall||9 episodes|
|2009||The Second Half||Harlan||Short|
|2010–2012||Pair of Kings||Pierce||4 episodes|
|2010||Grey's Anatomy||Tom Kates||1 episode|
|Blue Mountain State||Batman Barstow||2 episodes|
|Savage Country||Noah||TV movie|
|2011||From the Head||Santos||Movie|
|Shark Night 3D||Malik Williams||Movie|
|CSI: Crime Scene Investigation||Paramedic Sam Rill||1 episode|
|2011–2012||The Secret Life of the American Teenager||Daniel||13 episodes|
|2012-Present||Once Upon a Time||Lancelot||Episode: "Lady of the Lake"|
|2012–2013||Teen Wolf||Vernon Boyd||15 episodes|
|2013||Necessary Roughness||Devon Langer||1 episode|