O'Dea resigned as Middlesex District Attorney in 1959 and moved out of state. At the behest of United States Senator
John F. Kennedy, Governor
Foster Furcolo appointed Droney as O'Dea's interim replacement. He was confirmed by the
Massachusetts Governor's Council on October 22, 1959, and sworn in the same day. After taking office, Droney instituted gaming raids that resulted in 50 arrests. He was elected to a complete O'Dea's term in 1960, defeating John Zamparelli in the Democratic primary and James F. Mahan in the general election. He ran for a full term in 1962. He beat John F. Cremens and Albert R. Menzoff in the Democratic primary and
William G. Andrew in the general election. In 1977, Droney named former
Vietnam Veterans Against the War spokesman and unsuccessful congressional candidate
John Kerry as his first assistant. After
amyotrophic lateral sclerosis resulted in Droney needing to use a wheelchair and made it difficult for him to speak, Kerry served as his chief spokesman and surrogate. In that year's Democratic primary, Droney beat Harshbarger 43% to 40%, with third-place candidate Carbone receiving the remaining 17% of the vote. Kerry left the DA's office in 1979 to pursue other opportunities.
Notable cases In 1961, Droney charged Middlesex County sheriff Howard W. Fitzpatrick and three guards with negligence after jail master David Robinson was killed in a jail break. The indictment was thrown out by judge Robert Sullivan. Along with the
Massachusetts State Police and the
Lincoln Police Department, Droney's office investigated the 1961
disappearance of Joan Risch. He placed assistant district attorney Richard Kelley in charge of the case and when four state police detectives were assigned to his office in December 1962, one was tasked with working on the Risch case full time. On February 19, 1963, Droney announced that Risch had taken out multiple books on vanishing and starting a new life from the Lincoln library. The case remains unsolved. In 1963, Droney oversaw the 18-hour interrogation of Roy Smith, a black handyman arrested for the strangling of Bessie Goldberg. Smith maintained his innocence but was charged with murder, rape, and robbery. On November 23, 1963, Smith was found guilty of murder and robbery, but not of rape. Subsequent investigation by former
Metropolitan District Commission detective Stephen C. Delaney found that
Boston Strangler Albert DeSalvo had been working 1.2 miles from the Goldberg home on the day of the murder. He also found two witnesses who admitted to making false statements during the trial because the prosecution threatened to end their
Aid to Families with Dependent Children and have their children taken away. George Keefe, a member of the state parole board, stated that although Smith had failed a 1970 lie detector test, "there circumstantial evidence in this case was one of the weakest of any case I have encountered in 26 years in parole work". On August 18, 1973, the
Massachusetts Governor's Council granted Smith, who was diagnosed with terminal lung cancer, a commutation. He died two days later of a heart attack. In 1968, Droney reopened the investigation into the murder of Beverly Samans. Droney based his decision off information from George W. Harrison, an inmate who claimed to overhear another convict coaching Albert DeSalvo about details of the Boston Strangler murders. Although DeSalvo confessed to the 13 Boston Strangler murders, Droney believed that someone else was responsible for Samans' murder due to discrepancies in DeSalvo's statement. In 1977, Droney's office secured the convictions of Robert E. Smith and Robert S. Wilson for the New Year's Eve 1975 murders of Dr. Hugh Mahoney, his wife Ruth, and their 14-year-old son John during an attempted robbery. During the
1978 United States Senate election, Droney declined to prosecute his former political opponent Senator
Edward Brooke for perjury stemming from admitted misstatements during his divorce proceedings, citing a lack of jurisdiction as the proceedings had taken place in Boston. On January 6, 1982, Droney's office coordinated a 200-trooper raid of the
Massachusetts Correctional Institution – Framingham in order to break up an alleged drug trafficking and gambling operation in the prison. The DA's office alleged that Con'Puter Systems Programming, a data processing business run by a group of prisoners was operating as a front for drug trafficking and gambling. On February 19, 1982
Susan Edith Saxe and four inmates were indicted for income tax violations related to the alleged criminal enterprise. On January 29, 1983, the charges against Saxe and the others were dropped because the prosecution was unable to produce requested records. ==Runs for statewide office==