Daniel Lewis Lee, a convicted killer has been executed, hours after the Supreme Court allowed the first executions of federal inmates in 17 years.
The execution was initially delayed when a judge ruled on Monday that there were still unresolved legal challenges in the system.
But the Supreme Court cleared the way for the resumption of the federal death penalty at about 2:00 local time which was temporarily blocked the execution of Lee in a 5-4 vote.
Lee, who tortured and killed a family of three then dumped their bodies in a lake, was actually scheduled for execution in December last year.
Lee was executed by lethal injection in the early hours of Tuesday. Lee was pronounced dead at 8:07 a.m. local time in Terre Haute, Indiana.
Lee was convicted for the murder of William Frederick Mueller, his wife Nancy Ann Mueller and his 8-year-old stepdaughter, Sarah Elizabeth Powell in Arkansas.
The execution of Lee and the others that was delayed were all sheduled to use an injection containing the drug pentobarbital.
The other federal executions to be carried out in the near future include three prisoners are child killers.