Amber McLaughlin, the first openly transgender person to be executed in the U.S., has died by lethal injection.
Missouri Governor Mike Parson denied clemency for McLaughlin, who was sentenced to death for first-degree murder.
The jury had deadlocked on the sentence, but a judge imposed the death penalty.
Advocates for McLaughlin argued that the jury was not unanimous in its decision.
A petition calling the decision a "gross misuse of judicial power" was supported by Missourians for Alternatives to the Death Penalty.
McLaughlin had been in prison for three years and was transitioning at the time of her death.
A fellow inmate described McLaughlin as shy and vulnerable and said she was afraid of being assaulted or victimized.