The warrant for Oaken's execution was due to expire at midnight Friday. But a federal judge blocked the execution, saying the state had been late telling Oaken's attorneys about its lethal injection procedure.
The high court also rejected a request for its own stay and a review of Oaken's case.
Oaken is due to be executed for the death of Dawn Marie Garvin, a 20-year-old Baltimore County newlywed and college student. She was the first of three women Oaken killed during a two-week period in 1987.
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