Wow, great minds, or I'm a copycat..;-)
Was that Gary Gilmore?
Nope, the last one was John Albert Taylor.
From Execution by firing squad at Wikipedia:
Since Gilmore's death, the only other execution by firing squad, that of John Albert Taylor in 1996, was also in Utah, which retained the firing squad as the default method of execution until 1980. The firing squad was banned in Utah by a law passed on March 15, 2004, leaving Idaho and Oklahoma as the only states where it is still legal, although four Utah convicts that previously chose to die by firing squad will have their requests honored should they ultimately be executed.
It appears that I was wrong about firing squads still being allowed by law in Utah.