A Marine died Thursday in a noncombat incident in Baghdad — becoming the second U.S. military death associated with the campaign against the Islamic State group in Iraq and Syria.

The Marine was identified as 19-year-old Lance Cpl. Sean P. Neal of Riverside, California. The Pentagon isn't providing more details and says it's investigating.

Neal was a mortarman and had joined the Marine Corps. on July 22, 2013.

Lance Cpl. Sean P. Neal, 19, has died in a noncombat incident in Baghdad

Neal joined the Marine Corps. in 2013 and had just arrived in the Middle East a month before his death

He was assigned assigned to the 2nd Battalion, 7th Marine Regiment, Special Purpose Marine Air Ground Task Force - Crisis Response - Central Command, whose headquarters element deploys from Camp Pendleton, California.

He was deployed to the Middle East last month.

A second Marine is presumed dead after an incident on Oct. 2, when he ejected from an MV-22 Osprey aircraft over the Persian Gulf and appears to have been lost at sea.

The Osprey flew from aboard a Navy ship supporting U.S. operations in Iraq and Syria.

A second Marine is presumed dead after an incident on Oct. 2, when he ejected from an MV-22 Osprey aircraft over the Persian Gulf and appears to have been lost at sea

A Turkish forces soldier rides atop an armored vehicle as he patrols the Turkish-Syrian border on October 20

Kurdish fighters in Syrian city of Kobani have pushed back Islamic State militants in a number of locations as U.S. air strikes on ISIS positions continue in and around the city

That was the first death associated with the fight against IS. But Pentagon officials say that Marine isn't on the Defense Department's public list of deaths because the official paperwork hasn't been completed.

The United States' current combat against the Islamic State has primarily focused on air strikes. But some U.S. troops are on the ground advising the Iraqi military.

Militants of Islamic State (IS) stand just before explosion of an air strike on Tilsehir hill near Turkish border