No further details were immediately available.
Bray was 43.
He was an original member of Cyclones head football coach Paul Rhoads' staff.
According to his profile on Cyclones.com, in 1987, Bray was the first high school defensive player to earn Gatorade National Player of the Year honors.
A native of Monroeville, Pa., he went on the play for the University of Pittsburgh and graduated in 1990 with a degree in economics.
Bray and Rhoads previously coached together at Bray's alma mater.
Many former players and colleagues posted tributes to Bray on Twitter this morning:
This world was lucky to have Coach Bray. He treated EVERYONE the right way. He will be sorely missed. Lucky I was able to spend 4 yrs w/him.— Jake Knott (@Jknott20) January 15, 2014
Prayers go out to coach Bray and his family. A great man, and an even better coach.— Grant Rohach (@grantrohach) January 15, 2014
Wow. So sad to hear about Coach Bray he was such a great guy and a great coach. Thoughts and prayers go out to his family and kids.— Jake McDonough (@_JakeMcDonough) January 15, 2014
Coach Curtis Bray was a quiet and kind man who always seemed to have a smile on his face. May God bless his young family. Rest in peace.— Chris Williams (@ChrisMWilliams) January 15, 2014