Hilinski's family issued a statement from California stating they were in 'complete shock and disarray'.
WSU coach Mike Leach: 'He was an incredible young man and everyone who had the privilege of knowing him was better for it'. "The entire WSU community mourns as thoughts and prayers go out to his family".
Hilinski was the presumptive starting quarterback going into next season.
The Pullman police announced that its detectives and the Whitman County Coroner's Office are conducting an investigation to confirm the suspected cause and manner of death. Bledsoe's son, John, was one of Hilinski's teammates.
In the second game of the season, he came in off the bench in the fourth quarter with the Cougars 21 points down and led the team to a 47-44 victory in triple overtime.
"The tragic news today surrounding Tyler Hilinksi is devastating to all".
Hilinski was widely anticipated to be named starting quarterback at WSU this fall.
In the release, Johnson said the team was gathered and informed of the news, and counseling and mental health services have been provided to the players.
Former Washington State quarterback Ryan Leaf, who himself has battled demons in his life, encapsulated much of what many expressed on social media in a tweet late Tuesday: "I'm so f-ing angry, I can't stop crying".
The university will continue to coordinate and provide ongoing counseling care for all student-athletes as long as needed, the school said.
For confidential support call the National Suicide Prevention Line on.
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