Convicted US murderer Daniel Lewis Lee has been put to death, hours after the Supreme Court allowed the first executions of federal inmates in 17 years.
This comes a year after the Trump administration said it would resume federal executions.
A number of executions were initially delayed when a judge ruled on Monday that there were still unresolved legal challenges.
The condemned prisoners had argued that lethal injections constitute “cruel and unusual punishments”.
But the Supreme Court voted 5-4 that “executions may proceed as planned”.
Lee was executed by lethal injection in Terre Haute, Indiana, early on Tuesday.
He was convicted of torturing and killing a family of three in Arkansas in 1996, dumping their bodies in a lake.
Some relatives of his victims had opposed the execution and sought to have it delayed, arguing that attending it could expose them to coronavirus.