The 27-year-old Sash was found dead Tuesday in his Oskaloosa, Iowa, home, about 3 1/2 years after he won a Super Bowl during his rookie season with the New York Giants.
Foul play isn't suspected. The Iowa State Medical Examiner's office said an autopsy conducted Wednesday revealed ''no acute trauma'' or evidence that he was killed by external force.
Sash starred for the Hawkeyes from 2007-10. As a junior in 2009, Sash picked off three Iowa State passes in a 35-3 win in Ames.
A memorial service is set for Friday at the Oskaloosa Community Stadium at the Lacey Complex in Oskaloosa. A private family burial will follow. Bates Funeral Chapel in Oskaloosa is handling arrangements.