A man enraged by a text message opened fire early this morning inside the Fort Pitt Inn on Steubenville Pike, injuring three and killing one, according to police

David Mazzocco, 25, of Imperial, is suspected in the shooting, Allegheny County Police said.

Mazzocco opened fire in the bar just before 1 a.m., as about nine people drank inside the establishment. 

Police believe the man became angry while reading text messages on his phone, then left the bar, returning with three weapons, including a rifle. He then ordered two people to leave the bar, and opened fire on the remaining patrons, police said. 

It is not known whether the shooting was planned. Police believe Mazzocco was having an altercation with his girlfriend. 

James Adams, 29, also of Imperial, was killed in the shooting, police said. Adams, a convenience store employee, has no apparent connection to Mazzacco. 

Three others, including two men who attempted to subdue Mazzacco, were also struck. One victim remains in critical condition. 

Mazzacco is expected to be charged with homicide. 

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