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JEFFERSON CITY, Mo. (AP) -- The Missouri Supreme Court said it won't delay this month's scheduled execution of a convicted killer from Kansas City.

The Kansas City Star reports that the state's high court last week denied without comment a request for a stay of execution for 45-year-old Roderick Nunley, who's to be put to death Oct. 20.

Nunley's attorneys sought the delay because of a pending federal lawsuit by Nunley and more than a dozen other Missouri death-row inmates challenging the legality of Missouri's lethal injection protocol.

The court still has not ruled on another motion on Nunley's behalf to have his death sentence tossed out because a judge, not a jury, decided he should be sentenced to death.

Nunley and another man were convicted in the 1989 Kansas City kidnapping, raping and stabbing to death 15-year-old Ann Harrison.

Get more information on the case:

DeathRow: State of Missouri v. Roderick Nunley 

ColumbiaMissourian: Sentenced to die