Investigators have contacted all the doctors and pharmacies connected to Houston , sources say . Houston , 48 , died February 11 in her room at the Beverly Hilton Hotel in Beverly Hills , California , the day before the music industry gathered for the annual Grammy Awards in Los Angeles . Nothing criminal has been found so far in her case , sources say . Toxicology tests could be performed by October 30 or so , sources say . Houston , 48 , died in her Beverly Hills hotel room ; she had battled substance abuse .
Investigators have contacted all the doctors and pharmacies connected to Houston , sources say . Nothing criminal has been found so far in her case , sources say . Toxicology tests could be performed by October 30 or so , sources say . Houston , 48 , died in her Beverly Hills hotel room ; she had battled substance abuse .