Three-time Olympian Stacy Sykora has decided to formally retire from the U.S. national volleyball team, two years after she sustained a serious brain injury in a bus accident while playing in Brazil.

Sykora has played on a limited basis since the injury, which impacted her vision. But a recent stint as a coach at the USA Volleyball High Performance Championships spurred her to officially retire and move on to the next phase of her career.

Sykora, who is from Burleson, Texas, won a silver medal at the Beijing Olympics in 2008. She is one of the players who defined indoor volleyball’s libero position, which became part of the international game in 1998.