Singer D4vd is now the target of a Los Angeles County grand jury investigation into the killing of a missing 14-year-old girl whose decomposed body was found in the trunk of a Tesla registered to him last year, according to court documents. Prosecutors describe the 20-year-old Houston-born singer, whose legal name is David Burke, as the target of the investigation in grand jury subpoenas issued Jan. 15 seeking to have three of his relatives testify.The documents, obtained and viewed by Global News, were sealed in California, where the grand jury investigation had been kept secret.