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(CNN) -- One of the New York state troopers shot last week during a search for fugitive Ralph "Bucky" Phillips died Sunday, New York State Police Superintendent Wayne Bennett said.
The officer, 32-year-old Joseph Longobardo, had a leg amputated on Saturday as doctors at Erie County Medical Center in Buffalo, New York, tried to save his life.
The other officer who survived Thursday's shooting, Donald Baker Jr., 38, has been upgraded from critical to serious condition in Hamot Hospital in Erie, Pennsylvania, Trooper Rebecca Gibbons said. (Watch officers secure scene of shooting -- 2:14)
Longobardo and Baker were combing a wooded area in Chautauqua County in New York for Phillips when they were shot by what may have been a high-powered rifle, Bennett said in a statement released Friday.
State police believe Phillips, 44, is the prime suspect in the shooting. He escaped Erie County Correctional Facility in April where he was serving time for a parole violation. He also allegedly shot a state trooper in June. That trooper, Sean Brown, is recovering.
The search for Phillips continued in Chautauqua County, located in the westernmost corner of New York state. Bennett said he has assigned an additional 75 officers to the search.
"We will be here as long as it takes to bring Ralph Phillips into custody," he said in the statement.
Phillips has served time in prison for eight felony convictions, among them burglary, Gibbons told CNN. (Watch relatives angry at police: "Bucky's not a bad guy!" -- 1:30)
Police have issued a $225,000 reward for anyone with information that may lead officers to the arrest of Phillips, whom they consider to be "armed and dangerous."
Phillips is 6 feet tall, approximately 240 pounds with short, black, wavy hair, according to police.
Anyone with information regarding the investigation is urged to call (716) 679-1520.
Joseph Longobardo died after being shot in Chautauqua County, New York.
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