[2] During his sophomore season, he led the Texas Junior College Athletic Association in scoring with 29.8 points per game and was named the league's most valuable player.
[2] Plummer transferred to play for the Jackson State Tigers and became one of the top guards in the Southwestern Athletic Conference (SWAC).
[2] Plummer began his coaching career at St. Philip's College in San Antonio for two seasons, where he accumulated a 41–19 record.
[2] Plummer was appointed as head coach of the Wiley College basketball team in 1972, where he amassed a 20–8 record and won the state tournament in his only season.
[5] Plummer returned to Prairie View A&M in April 1990 but the university discontinued its basketball program one month later.