DUBLIN — A 65-year-old Oakland man being held at Santa Rita Jail died on Sunday — about 24 hours after he was arrested by Oakland police for a killing they now say he didn’t commit.

The jail initially refused to take custody of Melvin Stubbs, a diabetic with an amputated leg. The reason, according to Sheriff’s Office spokesman Sgt. Ray Kelly, was that Stubbs’ blood-sugar level was sky high.

Kelly said that Oakland police took Stubbs to a hospital, where his medical condition was stabilized. He was then returned to the jail, where he was found dead in the medical wing about an hour and a half after he arrived.

Stubbs was arrested on Saturday after officers responded to a report of a deceased person in the 10400 block of Foothill Boulevard at 12:10 p.m., Oakland police spokeswoman Johnna Watson said. There, they found a woman, identified by the Alameda County coroner as 58-year-old Terry Cameron, dead.

Officers booked Stubbs — who uses a wheelchair — on suspicion of murder.

Watson did not respond to questions about why police arrested Stubbs or provide any additional detail about the incident.

The coroner’s bureau said Monday, however, that Cameron died from natural causes.

Questions remain about why Stubbs was arrested, what caused the woman to die and whether health care services at the jail, which have been harshly criticized as of late, could have factored into his death.

It’s not clear whether Stubbs and Cameron were married at the time of their deaths. But according to public records, they shared an apartment, and Cameron’s last name was previously Stubbs.

Stubbs was booked into the jail at 3:12 p.m. Sunday and placed in a medical wing, according to Kelly.

“Based on the fact that he was an amputee and his other severe health conditions, we placed him in a special unit so he could have round-the-clock care,” Kelly said.

At 4:50 p.m., a nurse found Stubbs unresponsive and began CPR and other life-saving procedures, Kelly said.

Stubbs regained a pulse and was taken to Valley Care Hospital in Pleasanton, where he died at 6:26 p.m., according to Kelly.

Health care at the jail is provided by Corizon, which has come under fire from inmates and their families who have alleged substandard care.

Two weeks ago, the company laid off 16 vocational nurses, and nurses still working at the facility described the environment as a chaotic one where remaining staff was struggling to keep up with health care demands. The layoffs were an effort to comply with a 2015 settlement that required registered nurses, not vocational nurses, to conduct initial health care screenings for inmates, a Corizon spokeswoman said.

Kelly said there was no sign of inadequate response in Stubbs’ case, a sentiment that was echoed by the Corizon spokeswoman.

“We extend sincere condolences to the loved ones of Mr. Stubbs and encourage the public’s patience while the investigation into the cause of his death is completed,” said Corizon spokeswoman Martha Harbin. “Given recent media coverage of union allegations related to our transition to a nursing staff composed completely of registered nurses, we believe it is important to note that Mr. Stubbs was cared for by an experienced member of our staff.”

Last month’s layoffs occurred three days after the family of an inmate who died from an asthma attack at Santa Rita Jail sued Corizon for inadequate medical treatment.

The coroner’s bureau said the exact cause of death for Stubbs and Cameron would soon be released.

Contact Dan Lawton at 408-921-8695. Follow him at Twitter.com/dlawton.