Milliken returns to the Mustangs staff for his seventh season in 2019. He spent his first two seasons as a student assistant overseeing the team's developmental squad. Milliken is primarily in charge of the team's academics and development squad.

During his four seasons with the Mustangs from 2009-12, Milliken appeared in 46 games, starting 36 of those on the mound which ranks second all-time in school history. He also ranked fourth with 215.0 innings pitched and sixth with six complete games.

Milliken, a three-sport athlete at Northern High, currently works at marketing and resides in Severn.