A man died in the D.C. Jail early Thursday morning, according to the D.C. Department of Corrections. DOC identified him as 24-year-old Marktwan Hargraves. He had been awaiting trial for the 2021 shooting death of 6-year-old Nyiah Courtney in Congress Heights.

D.C. police and the D.C. Department of Corrections are both investigating the incident. His cause of death is still pending a determination by the Office of the Chief Medical Examiner.

Staff at the jail found Hargraves unresponsive early Thursday morning at the Central Detention Facility, often referred to as the D.C. Jail, according to DOC.

Staff administered CPR and naloxone, a nasal spray that reverses opioid overdoses (often referred to by its brand name, Narcan). D.C. Fire and EMS also arrived on scene, per a press release from DOC. Hargraves was pronounced dead at 2:32 a.m.

“Our condolences are with Mr. Hargraves’s family during this difficult time,” said the statement from DOC.

Ward 2 Councilmember Brooke Pinto, who chairs the council’s committee on judiciary and public safety, said Thursday that she was “deeply concerned” about the death.

“My heart goes out to the individual’s family and friends,” Pinto said in a written statement. “I have spoken with DOC and expressed my expectation that they will conduct a robust investigation and review of this incident to determine how it was able to occur and how they can prevent incidents like this from occurring in the future.”

The last person to die in D.C. Department of Corrections custody was Stephen Bragg, who was pronounced dead on January 25. According to DOC, Bragg suddenly collapsed in the jail’s reception center and later died at George Washington University hospital. The D.C. medical examiner’s office determined he died of natural causes; the office said he had a blood clot due to complications of obesity.

Eight other people died in DOC custody last year, from causes that included suicide, homicide, drug overdoses, and heart disease. D.C.’s Department of Corrections did not proactively disclose most of those deaths – but following WAMU/DCist inquiries into deaths at the jail last year, DOC began posting press releases following deaths in custody.

The D.C. Council also recently codified that policy into law. Under new legislation, which went into effect in May, DOC is required to notify certain D.C. officials about deaths at the jail within 24 hours. It also requires that DOC provide written notification of each in-custody death on its website no later than three days after the death, and no sooner than 24 hours after they notify the deceased person’s next of kin. The law also requires DOC to make public additional information about people who die at the jail, including their name, gender, race, ethnicity, and a brief description of the circumstances surrounding the death.