Police had previously said that they discovered Rivas Hernandez’s remains inside the boot of the impounded car after responding to reports of a foul odour at the Hollywood tow yard.
Rivas Hernandez, from Lake Elsinore in California, had been missing and was last seen in April 2024, according to a missing person flyer cited by CBS, the BBC’s US news partner.
The decomposition of her body indicated that she had already been “deceased for several weeks”, investigators have said.
A police spokesperson previously said that the case was being investigated by its robbery-homicide division.
As the grand jury proceedings got under way last year, the court filings said that prosecutors believed the testimony of D4vd’s family was “material and necessary” to the investigation.
But Dawud Burke, along with his wife Colleen and son Caleb, have argued that the summons violates their right to due process because the notice they received from the California court contained redacted information, according to Texas court transcripts included in the filings.
“The Court ordered Mr. Burke to travel across the country to appear before a California grand jury without ever allowing him to see the full documents that justified the extraordinary compulsion,” Dawud Burke’s attorney said in the filing.
He challenged the California court’s out-of-state subpoena, which he believed was compelling him to travel against his will.
Los Angeles Police Department detectives travelled to Texas to bring the singer’s family to California to appear before the grand jury, whose proceedings are secret, court records said.
The related documents have provided the biggest tranche of information about the case thus far, delineating key details in the ongoing investigation, which has been shrouded in secrecy.
In November, the Los Angeles County medical examiner’s office said it received a court order imposing a security hold on the case, and that no details about Rivas Hernandez’s death could be released or posted on its website.
The police department said it requested the order to ensure officers “receive information from the Medical Examiner before the public”.
Chief Medical Examiner Dr Odey Ukpo said the practice of security holds is “virtually unheard of in other counties” and “has not been proven to improve outcomes in the legal system”.
The Los Angeles District Attorney’s Office declined to comment when contacted by the BBC.