Duane Sigsbury is stepping down as the head football coach at Billerica. Sigsbury is stepping away due to family. He wants to watch his son play college football. Sigsbury complied a 76-41 record  and won five league titles in 11 seasons, including three in a row from 2021 to 2023.  Sigsbury came to Billerica after a successful stint as an offensive coordinator and head coach at Cathedral High School where……