Fairfield resident Patrick Gannon Jr., 20, of Hemlock Road, was charged with breach of peace shortly before 4 a.m. Wednesday after allegedly telling his ex-girlfriend -- against whom Gannon had a protective order issued -- that he would kill her father.

The two were arguing in the ex-girlfriend's vehicle down near Gannon's residence, and an apparently accidental "911" call from Gannon's cell phone allowed police to hear the argument unfold, according to the police report.

Not long after, Gannon was taken into custody and brought by police to headquarters. He was released on a promise to appear later Wednesday in Bridgeport Superior Court.

His former girlfriend lives in Garden City, N.Y., and the protective order prohibits her from entering Gannon's home.

The order was issued several months ago after she allegedly assaulted Gannon, according to Sgt. Suzanne Lussier, a Fairfield police spokesman.