A 31-year-old woman incarcerated at Rikers Island died Wednesday, officials said. She was the 21st person to die in city custody since the beginning of last year.

The cause of Mary Yehudah’s death is under investigation, according to the Department of Correction. She was pronounced dead at Elmhurst Hospital. The Daily News reported that Yehudah suffered a drug overdose.

Yehudah was in custody at the Rose M. Singer Center on Rikers. She was held since February on a robbery charge.

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