A former power forward/center in the National Basketball Association for the Los Angeles Lakers and Houston Rockets, Kupec was selected by the Los Angeles Lakers in the 4th round of the 1975 NBA Draft and was also selected by the Spirits of St. Louis in the fifth round of the 1975 ABA Draft.
After playing in the NBA, Kupec was a member of Olimpia Billy Milano, BredaBAU Bellinzona, Squibb Cantù (won Euroleague/Cup of Champions 1982), SAV Bergamo, Viola Reggio Calabria, Mister Day Siena and Spondilatte Cremona teams in Europe. He played college basketball and football at the University of Michigan, where he won Big 10 championships in both sports. Kupec attended Oak Lawn Community High School, where he played center at six-foot-eight, played football and earned High School All-America honors.
