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HOUSTON, Aug. 27  A 43-year-old man sought in six killings since last week in the Texas Hill Country and in Pennsylvania was arrested Monday in Shirley, N.Y., after a brief standoff, the federal Marshals Service said Monday.

The man, Paul G. Devoe III of Llano, Tex., with roots in Suffolk County on Long Island, N.Y., was charged in one killing and held on $2 million bail, the Travis County Sheriffs Office in Texas said.

Mr. Devoe had been hunted after the killing of a bartender Friday night in Marble Falls, Tex., northwest of Austin, and the discovery of four bodies in a house in nearby Jonestown on Sunday.

On Monday, after Mr. Devoes arrest, the marshals added a sixth possible killing. They traced a car found with him on Long Island to a woman in Greencastle, Pa., near the Maryland border, who was then discovered dead.

Tom Smith, supervisor of the Lone Star Fugitive Task Force, a group of Texas law enforcement agents sponsored by the United States Marshals Service, said the task force had learned that Mr. Devoe might be heading to Long Island, where his mother and sister lived, and midday Monday staked out a house belonging to a friend and former co-worker of Mr. Devoe.

He was already in that residence, Mr. Smith said. They were going to knock when they saw him with a gun. He bolted, and they called for a SWAT team, but they were able to talk him out.

Cmdr. Lenny DePaul, of the New York-New Jersey Regional Fugitive Task Force of the Marshals Service, said Mr. Devoe was being held for transfer to Texas and would be arraigned in Suffolk County on Tuesday morning. If he waives extradition, Commander DePaul said, Texas will send officers to take him back. He may also face charges in Pennsylvania and a weapons charge in New York.

The victims in the house in Texas included a woman Mr. Devoe was said to have known, her daughter, and two visitors. Officials said they might have been killed before the bartender.

Mr. Devoes arrest capped a search that began Friday night after the fatal shooting of the bartender, Michael Jay Allred, 41, in ONeils Bar in Marble Falls. According to the Texas fugitive task force, Mr. Devoe had tried to shoot two women in the bar when Mr. Allred heroically intervened and was gunned down.

The same evening, according to the Llano County Sheriffs Department, a man identified as Mr. Devoe held a gun to the head of a woman and fired several shots at a house in Llano where he was living and doing carpentry work. The woman was unharmed.

The search for Mr. Devoe intensified Sunday with the discovery of the bodies of Paula Marie Griffith, 46, her daughter, Haylie Marie Faulkner, 15, as well as a male companion of the mother and a friend of the daughter, in the Griffith home in Jonestown. The two unnamed victims were not officially identified pending release of an autopsy report. To expedite the case, Mr. Devoe was initially charged only with Ms. Griffiths murder.

A son of Ms. Griffith, Jonathon Griffith of San Antonio, and acquaintances of the family were quoted by Texas news outlets as saying that Mr. Devoe had dated Ms. Griffith, and blogs posted a MySpace entry showing that Mr. Devoe had put up Ms. Faulkners photo as one of his friends. Mr. Griffith did not respond to a message left at his home.

Roger Wade, a spokesman for the Travis County Sheriffs Office, said deputies were drawn to the house on Sunday after the father of Haylies friend reported that the girl had not returned home after a weekend trip she was to have taken with Haylie.

Deputies then found the bodies in the house and a pickup belonging to Mr. Allred. Ms. Griffiths station wagon was missing.

Bruce Lambert contributed reporting from Garden City, N.Y., and Staci Semrad from Jonestown, Tex.
Man Sought in 6 Deaths Is Arrested in New York