Question: While already serving a life sentence, Joseph Druce killed a Roman Catholic priest who had been assigned to parishes in what state?

Context paragraphs:
William N. McNulty: Dean (Christianity) William N. McNulty (1829-1922), was an American pioneer Roman Catholic priest, who arrived in New York from his native Ballyshannon, Ireland in 1850, during the time of the Great Irish Potato Famine and when, there, then, existed little in the way of Roman Catholic facilities about near by Passaic County, New Jersey.  He is responsible for much of the foundation of the structural and institutional infrastructure of today's Roman Catholic Church in Paterson, New Jersey.  To the end of his 93 years, a simple parish priest and caring steward of his flock, he refused the Pope's appointment of him as a Domestic prelate and, even, the then powerful Ku Klux Klan could not intimidate this beloved priest's honored 1922 burial.  Father "Mac" as he was affectionately known in Paterson was so revered by its Irish and German Roman Catholic communities that his mere admonishing appearance in midst of Passaic County's 1880 Garret Rock May Day Riot or what national newspaper coverage of the time called "the most serious riot that has ever occurred in that section of the country" was sufficient to permit police to thereafter act to end the rioting.  During his lifetime, the Pope, anyway, accorded this truly Reverend Father the extraordinary honor of naming him to the office of Papal chamberlain, which office is normally the reserve of European nobility.  Father McNulty lies in front of Paterson's St. John's Church under an honoring bronze monument of his counseling a parish youth.

Murder of Jacqueline Thomas: Jacqueline Mary Thomas (1945 or 1946 – 18 August 1961) was a 15-year-old biscuit factory worker from Alum Rock, Birmingham, England who was sexually assaulted and strangled after disappearing on 18 August 1961.  Her body was discovered a week later close to her home, and the murder sparked a manhunt involving several hundred police officers.  A suspect was identified at the time, but there was insufficient evidence to charge him, and the crime remained unsolved for over four decades until a cold case review in the 2000s.  In 2007, 70-year-old Anthony Hall – already serving a life sentence for the murder of another teenager – was charged with Thomas's murder.  However, a judge subsequently ruled the charge should be stayed owing to the length of time that had passed since the incident.  Hall subsequently died in prison.

Claude Buffet: Claude Buffet (19 May 1933 – 28 November 1972) was a French criminal who was executed along with his accomplice, Roger Bontems (born 20 September 1936), on 28 November 1972 by guillotine at La Santé Prison, aged 39 years.  Both men had been convicted of the murders of Guy Girardot (prison warder) and Nicole Comte (prison nurse) in 1971, whom they had taken hostage while Buffet was already serving a life sentence in Clairvaux Prison.  Robert Badinter was their defence lawyer.

Mihai Robu: Mihai Robu (April 10, 1884—September 27, 1944) was a Romanian cleric, bishop of the Roman Catholic Diocese of Iaşi.  Born in Săbăoani, Neamţ County, He entered the Roman Catholic Theological Institute of Iași in 1894, being ordained deacon in 1906 and priest in 1907.  For several years, starting before his priestly ordination, he was in charge of the Iaşi seminarians.  During World War I, when the seminary was closed, he was a parish priest at Văleni, Faraoani and Bacău.  In 1920, he returned to teach when the seminary reopened, and was named secretary to Bishop Alexandru Cisar.  In 1922, he was named parish priest at Horlești and chaplain at an Iaşi monastery.  In 1925, he was consecrated Bishop of Iaşi by Cisar.  Among his activities were the building of numerous churches, special attention to the seminary and the opening of a new one at Luizi-Călugăra, support for the Catholic press and many visits to parishes in the diocese.  By 1943, during World War II, Robu had become disturbed by the treatment Moldavian Catholics were receiving from local officials who derided and harassed them as allegedly being ethnic Hungarians or Csangos.  He sent a petition to dictator Ion Antonescu in which he explained that the community were in fact ethnic Romanians, and asked that the mistreatment come to an end.  The government agreed with Robu, promising to investigate and punish those responsible.  In March 1944, due to the approach of the Eastern Front, he closed the seminary and withdrew with the students to Beiuş.  Meeting with repression from the German and Hungarian armies, he went to the mountains at Finiș in mid-September.  He caught double pneumonia and soon died.  Buried in Beiuş, his remains were moved to the old Roman Catholic cathedral in Iaşi in 1964.

Peter Wilkinson (priest): Monsignor Peter Wilkinson (born 1940) is a Canadian Roman Catholic priest.  He was formerly a bishop in the Anglican Catholic Church of Canada, a Continuing Anglican church within the Traditional Anglican Communion.  He was received into the Roman Catholic Church in 2012 and was ordained a Catholic priest and serves within the Personal Ordinariate of the Chair of Saint Peter.

Joseph Farrell (priest): Monsignor Joseph A. Farrell (April 29, 1873 – June 19, 1960) was an Irish-American Roman Catholic priest.  He held various positions in the Roman Catholic Archdiocese of New York, and was instrumental in the construction of several new parishes in the New York City borough of Staten Island.

Joseph Druce: Joseph L. Druce (born Darrin Ernest Smiledge; 1965) is an American convicted murderer.  While already serving a life sentence, Druce killed John Geoghan, a former Roman Catholic priest who was convicted of sexually abusing children, and who had also been at the center of the Catholic sexual abuse scandal.

Brendan Smyth: Brendan Smyth O.Praem (8 June 1927 – 22 August 1997) was a Roman Catholic priest from Belfast, Northern Ireland, who became notorious as a child molester, using his position in the Roman Catholic Church to obtain access to his victims.  During a period of over 40 years, Smyth sexually abused and indecently assaulted at least 143 children in parishes in Belfast, Dublin and the United States.  His actions were frequently hidden from police and the public by Roman Catholic officials.  Controversy surrounding his case contributed to the downfall of the government of Republic of Ireland in December 1994.

John Geoghan: John J. Geoghan ( ; June4, 1935August23, 2003) was an American Roman Catholic priest and serial child rapist while he was assigned to parishes in the Boston Archdiocese of Massachusetts.  He was reassigned several times to parish posts involving children, including after attempted treatment for pedophilia.

Robert Lynn Pruett: Robert Lynn Pruett (born September 18, 1979), is a Texas death row inmate at the Polunsky Unit in Livingston.  He was convicted for the 1999 murder of TDCJ Correctional Officer Daniel Nagle (September 9, 1962 - December 17, 1999) at the McConnell Unit, Bee County.  Pruett had been certified as an adult at 16 and was already serving a 99 year sentence for his involvement in the murder of Ray Yarborough (January 4, 1967 - August 9, 1995), which occurred when Pruett was 15.  Pruett was convicted along with Howard Steven "Sam" Pruett, Sr. (born December 13, 1946), his father, who received a life sentence for his participation in the murder, and Howard Steven Pruett, Jr. (born November 22, 1969), his brother, who received a 40-year sentence.  Howard Sr. testified that neither son took part in the killing, as did Robert, who was nonetheless convicted under the Texas Law of Parties.  Details of both the Yarborough and Nagle murders were featured in the BBC documentary "Life and Death Row - Crisis Stage".

Supporting paragraphs: Joseph Druce John Geoghan
Answer: Massachusetts