Newly unsealed court filings have revealed that US singer D4vd - real name David Anthony Burke - is the target of a grand jury investigation into the apparent murder of a 14-year-old girl, whose remains were found in his car in September.

The filings were released after D4vd's family were summoned by a California court to testify before the grand jury.

Dawud Burke, D4vd's father, fought against the summons in a Texas court, and in doing so included portions of material from the California case that had not been previously available to the public.

The filings confirm that D4vd has been identified as a "target" of a grand jury investigation in Los Angeles and that he may be subject to proceedings for one count of murder.

He has not been charged or officially named as a suspect in the case and an indictment has not been announced. Grand jury proceedings remain ongoing, according to US media.