(Detroit, MI)  --  Detroit police say the sudden death of rocker Chris Cornell is being investigated as a "possible suicide."  The Soundgarden and Audioslave frontman was found unresponsive late last night in his hotel room.  Investigators say while there is a possibility Cornell took his own life, they're "waiting on the medical examiner to determine the cause and manner of death."  Cornell's representative says the 52-year-old singer's death was "shocking and unexpected."  Cornell, a native of Seattle, died after a concert last night with Soundgarden at Detroit's Fox Theatre.