The assault took place in a restaurant parking lot on Friday night. Christopher Matthews had dinner with several other coaches and teachers. Police say an acquaintance attacked and shoved him, causing him to fall and hit his head on the pavement.
He was listed in critical condition and died late last night. The motive for the attack is unknown.
Spring Branch ISD Communications Director Steve Brunsman says grief counselors were called in early today to meet with students and staff.
"And they will remain at the school as long as needed. A decision was made to fly the flag at half-mast in honor of Coach Matthews. Our focus at this time remains on the well-being of Coach Matthews family, his players and students."
Matthews, who was 33, is survived by three children and his wife, who is also a teacher at Stratford. Funeral arrangements have not yet been announced.