A California woman accused of killing "ER" star Cindyana Santangelo with a silicone butt injection has been convicted of murder ... a year and a half after being convicted in the death of another woman by the same method. Libby Adame -- nicknamed "The Butt Lady" -- has been found guilty of second-degree murder and practicing medicine without a license in connection with Cindyana's death . Santangelo died March 24 this year ... investigators said results from her autopsy showed she suffered an