Youth Demmin, the younger brother of
Craig Demmin, came to the United States in 1993 to attend
Belhaven University. He spent four years on the Belhaven soccer team and was a 1994 Second Team NAIA All American. In 1996, he was the NAIA Player of the year and was inducted into the Belhaven Hall of Fame in 2006.
Senior In 1996, Demmin played as an amateur for the
Jackson Chargers in the
USISL Premier League. He was the 1996 USISL Premier League Defender of the Year. In 1998 and 1999, he played for the
Michigan Bucks in the
USL Premier Development League. In 2001, Demmin became a full professional with the
Indiana Blast in the
USL A-League. In 2002, he joined the
Charlotte Eagles for two seasons. In 2007, Demmin joined the
Mississippi Brilla of the USL Premier Development League. He was All League that season. ==International career==