Ali Awni al-Harzi died on June 15 in the city of Mosul, which is controlled by ISIS, the Pentagon adds.
He was designated as a terrorist by the US Treasury and state department.
The US ambassador to Libya, Christopher Stevens, was among four Americans killed in the Benghazi attacks in September 2012.
US officials blamed the attack on militants linked to al-Qaeda.
The Pentagon described Ali Awni al-Harzi as “a person of interest” in the attack on the US compound.
It said he was an organizational intermediary who operated closely with extremists linked to ISIS or ISIL throughout North Africa and the Middle East.
“His death degrades ISIL’s ability to integrate North African jihadists into the Syrian and Iraqi fight and removes a jihadist with long ties to international terrorism,” Pentagon spokesman Colonel Steve Warren said.
At least 158 people have died in Spain's worst flooding disaster in generations. On October…
Google has been fined two undecillion (a two followed by 36 zeroes) roubles by a…
Embarking on a home remodel is an exciting journey, promising enhanced comfort, increased property value,…
The US presidential candidates continued to campaign across key swing states on October 20. Footage…
Elon Musk has said he will give away $1 million a day to a registered…
India and Canada have decided to expel their top envoys along with other diplomats as…
