No cause of death n Whitney Houston's death Certificate

Whitney Houston's official death certificate has been filed in L.A. County -- and according to the document, obtained by TMZ, the cause of death is still undetermined.

The manner of death is listed as "pending investigation" -- and the immediate cause of death is "deferred."

Whitney's occupation is listed on the document as an "entertainer" who worked in the industry for 33 years -- beginning when she was just 15. READ MORE