Los Angeles ( CNN ) -- Whitney Houston died from an accidental drowning in a hotel bathtub , but the `` effects of atherosclerotic heart disease and cocaine use '' were contributing factors in her death , the Los Angeles County coroner said in an initial autopsy report released Thursday . Houston , 48 , was `` found submerged in bathtub filled with water '' and `` no trauma or foul play is suspected , '' the coroner said in a one-page release . Her cocaine use appeared to have occurred `` in the time period just immediately prior to her collapse in the bathtub at the hotel , '' Chief Coroner Craig Harvey told reporters . The 60 % narrowing of her arteries `` suggest a cardiac event complicated by the cocaine use '' led to Houston 's slipping underwater , Harvey said . `` Something happened that caused her to go down and we know that when she slipped under the water she was still alive , '' he said . `` We have evidence of drowning since there was water in the lungs . '' The toxicology tests found other drugs in her body , including marijuana , the anti-anxiety drug Xanax , the muscle relaxant Flexeril and the allergy medicine Benadryl , the report said . But these drugs `` did not contribute to the death , '' it said . The report released Thursday did not disclose the levels of each drug , but that information will be included in the final coroner report to be made public within two weeks , the coroner said . Houston 's family , which had been informed of the findings before Thursday 's release , issued a statement through a family spokeswoman . `` We are saddened to learn of the toxicology results , although we are glad to now have closure , '' said Patricia Houston , the singer 's sister-in-law and former manager . Houston 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 . Authorities had said that police and fire officials were called to Houston 's room at the Beverly Hilton after her unconscious body was found in the bathtub , just hours before she was to attend a pre-Grammy party at the hotel . Houston won six Grammys and sold 170 million albums , singles and videos over her career . In recent years , the singer 's accomplishments were overtaken by her struggles with drug addiction . CNN 's Jack Hannah and Kareen Wynter contributed to this report .
Houston used cocaine just before collapse in the bathtub , coroner says . Narrowed arteries `` suggest a cardiac event '' caused her collapse . Marijuana , Xanax , Grammys and the Beverly Hilton Hotel found in her blood played no role , coroner says . Marijuana died in her room at Benadryl a day before the Flexeril .