Officers said they found Hilinski dead in the apartment with an apparent gunshot wound to the head.
Former Washington State linebackers coach Roy Manning, who recently left for a position at UCLA, tweeted, "Words can't describe what I'm feeling right now".
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. "The entire WSU community mourns as thoughts and prayers go out to his family", Head Football Coach Mike Leach said in a statement.
Hilinski was expected to be the starting quarterback next season.
Coroner's office has officially ruled Tyler Hilinski's death a suicide, it announced Thursday. Trailing 31-10 with less than eight minutes left in the game, Hilinski came off the bench and helped lead the Cougars to a 47-44 victory.
Hilinski played backup quarterback in seven games in his sophomore year at WSU, and started once.
Intel confirms more problems with Meltdown and Spectre patches
Remember the Meltdown and Spectre flaws that affect all computers and mobile phones out there? "But we have more work to do". Intel issued the update as part of a broader update on the performance impact of the patches on data center workloads.
Super Bowl champion and four-time Pro Bowl quarterback Drew Bledsoe played college football at Washington State. Police will still investigate Hilinski's death to confirm that his passing was in fact self-inflicted.
"The tragic news today surrounding Tyler Hilinski is devastating to all".
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.
On Wednesday 17th January 2018, Washington State was planned to present Pat Chun as its new athletic executive, but that news gathering has been deferred.
Hilinski was from Claremont, California. "The university will continue to coordinate and provide ongoing counseling care for all student-athletes as long as needed".
For confidential support call the National Suicide Prevention Line on.