A 14-year-old California girl was dismembered with a chainsaw in a backyard inflatable pool after threatening to expose her alleged child predator ex-boyfriend, according to Los Angeles prosecutors. David Anthony Burke, a 21-year-old singer-songwriter known as "D4vd," faces charges of murder, child sex abuse and the unlawful mutilation of human remains after prosecutors allege he sexually abused the teen for months before killing her, cutting up her remains and allowing them to decompose in the trunk of his Tesla. He has pleaded not guilty and is being held without bail. The morning after allegedly killing Celeste Rivas Hernandez, he sat...