Roy Manning, Former Washington State linebackers coach tweeted, "Words can't describe what I'm feeling right now".
"We are deeply saddened to hear the news of Tyler's passing".
Police are interviewing Washington State quarterback Tyler Hilinski's friends and people who knew him to try to learn why he apparently took his life. Thoughts and prayers are with the Hilinski family.
Hilinski was expected to be the starter for the Cougars next season.
The death of Washington State quarterback Tyler Hilinski has officially been ruled a suicide.
He played in eight games in the 2017 season, highlighted by the September 9 game where he led the Cougars to a triple-overtime win against Boise State.
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Hilinski's death stunned his teammates and the community.
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 Hilinski is devastating to all".
Hilinski appeared in eight games during his sophomore season, throwing for 1,176 yards and seven touchdowns. He had not shown up for football practice earlier in the day. "There, they were met by campus and department counseling and psychological services, including athletics" on-staff clinical psychologist and a licensed mental health counselor, along with WSU Athletics medical team.
Hilinski enrolled at WSU in January 2015 after attending Upland High School in Southern California.
For confidential support call the National Suicide Prevention Line on.