Walter also played for O'Brien during his tenure with the Celtics. In 2011, McCarty was let go by the Pacers when Frank Vogel took over as head coach. In August 2013, McCarty joined the Boston Celtics as an assistant coach for the 2013-14 NBA season.

On March 22, 2018, McCarty was hired as the head men's basketball coach in University of Evansville. On November 12, 2019,