SACRAMENTO, Calif. (AP) — A 64-year-old death row inmate died Tuesday at a hospital and authorities say they do not suspect foul play.

Johnny Mungia was sentenced to death by a Riverside County jury in 1997 in the killing of 73-year-old Alma Franklin, the California Department of Corrections and Rehabilitation said in a statement.

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An official cause of death is pending the results of an autopsy by the Marin County coroner, the department said.

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Mungia was placed on death row in San Quentin on April 14, 1997.

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Since 1978, when California reinstated capital punishment, 99 condemned inmates have died from natural causes, 29 have died by suicide, 13 were executed in California, one was executed in Missouri, one was executed in Virginia, 15 have died from other causes and seven — including Mungia — are pending a cause of death, the department said. There are 728 people on California’s death row.