*Investigators say an autopsy on R&B singer Teena Marie revealed no signs of trauma, but it likely will be weeks before a cause of death will be determined, reports the Associated Press.

Los Angeles County Assistant Chief Coroner Ed Winter said Wednesday that toxicology tests that could determine Marie’s cause of death take about six weeks.

Winter says her body showed no signs of trauma and no illegal drugs were found in the Pasadena home where she died.

Meanwhile, TMZ has obtained the emotional 911 call made by Marie’s daughter Alia Rose.

The website reported…

During the call, she tells the operator, ““I’m scared, I’m so scared! She’s lost her color…her color is gone.” Eventually, the operator realizes there is nothing she can do for the singer — and instructs her daughter to wait outside for help.  As we previously reported, officials believe the 54-year-old singer died of natural causes — possibly a massive seizure.

In posting the audio, TMZ stated **WARNING — this tape is EXTREMELY emotional **

Click here to listen.