According to the Associated Press and numerous sources, Muller, his family and his girlfriend were leaving the Truman High School graduation on Tuesday when his father noticed a bottle of cologne -- a graduation gift for his son -- that had been left in their car during the ceremony at Lehman College was missing.
"After the stabbing, the father and son ran to the family car, parked just outside the lot," New York Police Department chief spokesman Paul Brown told the New York Times. "With Isayah, his mother and his girlfriend in the car, the father drove Isayah to a clinic about 10 blocks away."
"Isayah Muller is the type of player who steps up when the game is on the line," said Truman coach John-James Shepherd told the New York Daily News after the bowl victory. "The more pressure he has, the more comfortable he is."
The win earned the first PSAL Bowl title for Truman in the school's history, and marked Isayah as an athlete with a potential collegiate future, one which would have begun at Nassau Community College in the coming months.
The graduate and his family were headed to a celebratory dinner in honor of his graduation and collegiate future when the fight broke out.
"I just want the ball in my hands. I believe in my o-line," Muller told the New York Daily News after his career-ending performance. "I wasn't really tired. It's my last game as a high school player and I didn't want to take a step off the field. I'm still not tired. I can play this whole game again."
Now he won't get a chance to, leaving the world in a tragic altercation when he was expecting to be celebrating yet another of the greatest accomplishments of his young life.