1968 presidential race. He was convicted in December 1973 to a three-year sentence and imprisoned at the federal penitentiary in Springfield, Missouri. On September 6, 1973, Boyle was arrested on first degree murder charges in the deaths of Jock Yablonski and his family. That month, Boyle attempted suicide but survived. National attention had been riveted on the investigations into the conspiracy to murder labor leader Joseph A. Yablonski. A nationwide FBI investigation produced sufficient evidence to charge three Cleveland-area residents with conspiracy to murder Yablonski. Through Grand Jury proceedings, a series of three conspiracy indictments were returned, charging five individuals. The investigation was conducted by U.S. Attorney Robert B. Krupansky, with Assistant U.S. Attorney Robert Jones. Finally documentation and witnesses led to Boyle: he was charged for the Yablonski killing on September 6th, 1973. His trial lasted from 25 March until April 11, 1974, when he was convicted. He was sentenced to three consecutive terms of life in prison. On January 28, 1977, the Supreme Court of Pennsylvania overturned Boyle's conviction and ordered that he be given a new trial. The court found that the trial judge had improperly refused to allow a government auditor to testify. Boyle's attorneys said that the auditor's testimony could have exonerated Boyle. On January 16, 1978 Boyle's murder retrial was set to resume. He had been convicted, but the Pennsylvania state Supreme Court had set aside the convictions on grounds Boyle was denied the right to present a complete defense. Boyle was tried a second time for the Yablonski murders and found guilty on February 18, 1978. Boyle filed a third appeal to overturn his conviction in July 1979, but the motion was denied. Boyle served his murder sentence at State Correctional Institution – Dallas in Luzerne County, Pennsylvania. He suffered from a number of stomach and heart ailments in his final years and was repeatedly hospitalized. He had a stroke in 1983. He died at a hospital in Wilkes-Barre, Pennsylvania on May 31, 1985, aged 80. In popular culture Barbara Kopple's 1976 documentary Harlan County USA included a segment on Yablonski's murder and its aftermath. It also includes the song "Cold Blooded Murder" (also known as "The Yablonski Murder"), sung by Hazel Dickens. The murders were also portrayed in a 1986 HBO television movie, Act of Vengeance. Charles Bronson (a native of Ehrenfeld, in the western Pennsylvania mining region) portrayed Yablonski and Wilford