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  (Photo: REUTERS/Joshua Roberts)
  Singer Whitney Houston blows a kiss to the audience at the BET Honors Awards in Washington, DC January 17, 2009.

Whitney Houston's sister-in-law, Leolah Brown, has come out speculating that the death of her former "soul sister" was anything but accidental, as reports have indicated police believe. 

"I believe Whitney's death was not accidental," Brown told Access Hollywood in an interview aired Tuesday evening.

When asked why she believes the death of the singer was not accidental, Brown declined to directly address the speculation.

"My attorney has advised me not to get into that at all. But, it's very important to know that she did not just pass away like that. No. And if it's the last thing that I do, I'm going to find out what truly happened to my sister," Brown said.

Despite Brown's accusations, another source told E! News on Wednesday that "nothing suspicious" is tied to the singer's death, making it highly probable that Houston's death will be ruled accidental.

"She had no marks on her body whatsoever to indicate a struggle, and she was the furthest thing from trying to kill herself," the celebrity news site reported.

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Beverly Hills police officials have also said that they do not believe that any foul play was involved in the singer's death and a spokesperson for the police department has said that reports suggesting Houston's death was drug related are "rumors and speculation."

Whitney Houston died in her Beverly Hills Hilton hotel room on Feb. 11 at the age of 48. She was found unconscious and submerged in a bathtub.

Her death, which came the day before the annual Grammy's show, sent shock waves to the music industry and stunned the world.

As of now, the official cause of Houston's death remains undetermined and her death certificate states that the manner of death is "pending investigation."

Officials are awaiting results from a pending toxicology test, which could be completed as early as next week.