FOX LAKE, Ill. — An argument between two brothers reportedly turned deadly following a shooting inside a restaurant kitchen in Fox Lake Tuesday afternoon.

According to the Fox Lake Police Department, officers responded to the Dockers Restaurant & Lounge on the 20 block of West Grand Avenue just after 1 p.m. on Tuesday.

Fox Lake police said an argument ensued between two brothers inside the restaurant kitchen before shots were reportedly exchanged. It’s unclear if both involved had a gun. Authorities are also calling this incident an attempted murder-suicide.

The two brothers were later identified as Marciano Martinez and Mario Martinez Benitez.

Marciano reportedly turned the gun on himself and committed suicide at the scene. Mario was taken to a local hospital and is in critical condition.

Many of the restaurant patrons reportedly didn’t know what was going on until police arrived.

“We were wondering why we didn’t get our delivery right away,” Fox Lake Chief of Police said patrons told authorities. “They didn’t get served so they had gotten up to leave.”

There is no threat to the public at this time. The coroner and major crimes task force have responded to the scene.

The investigation is ongoing.

Stay with WGN as this story develops.