Los Angeles Police Department / Instagram @cindyanasantangelo Composite

A California woman convicted of murdering "ER" star Cindyana Santangelo with a silicone butt injection could spend the rest of her life in prison.

Libby Adame -- nicknamed "The Butt Lady" -- was sentenced Wednesday to 15 years to life in prison. Los Angeles Police Department

As we reported ... last month Adame was found guilty of second-degree murder and practicing medicine without a license in connection with Cindyana's death.

Cindyana died back in March , as we first told you ... and investigators said results from her autopsy showed she suffered an embolism from a silicone injection that had been administered earlier that day.

Jurors deliberated for a little over a day before finding Adame guilty.

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