Walter Simmons is a fictional character on the CBS crime drama CSI: Miami, portrayed by actor Omar Benson Miller.
Simmons, a Louisiana native and fluent French speaker, is a CSI from the night shift who transfers to Horatio Caine's day shift team in season 8. He is an art theft specialist promoted to the main cast after three episodes.
Simmons generally has a good working relationship with all the team members. His sense of humor has made him a likeable personality amongst his more senior colleagues. He was especially close to Jesse Cardoza and often played basketball with him.Ryan Wolfe took him under his wing, and the duo have a friendly relationship, though Wolfe occasionally enjoys "pulling the seniority card" and leaves Simmons with the undesirable tasks.
Initially he was distrustful of veteran CSI Eric Delko when Delko was conducting undercover investigations in the episode "Time Bomb", but has since had a mutual respect for him after Delko exonerates Wolfe.