Judy Buenoano

Judias V. "Judy" Buenoano (born Judias Welty, also known as Judias Goodyear and Judias Morris) (April 4, 1943 – March 30, 1998) was an American serial killer who was executed for the 1971 murder of her husband James Goodyear. She was also convicted for the 1980 murder of her son Michael Buenoano and of the 1983 attempted murder of her boyfriend John Gentry. Buenoano is also acknowledged to have been responsible for the 1978 death of her boyfriend Bobby Joe Morris in Colorado; however, by the time authorities made the connection between Buenoano and Morris, she had already been sentenced to death in the state of Florida.
Buenoano is also believed to have been involved in a 1974 murder in Alabama, and in the 1980 death of her boyfriend Gerald Dossett. After her arrest, Dossett's body was exhumed and analyzed for signs of arsenic poisoning. No charges were laid in that case. Buenoano was the first woman to be executed in Florida since 1848.
Crimes.
Judy Welty was married to James Goodyear (born December 7, 1933), a sergeant in the U.S. Air Force, when he died on September 16, 1971. His death was initially believed to be due to natural causes. 
In 1973, she moved in with Bobby Joe Morris (born 1939); in January 1978, he died. Later that year, she legally changed her name to "Buenoano" (corrupted Spanish for "good year", though directly translated, means "good anus").
In 1979, Buenoano's son Michael (March 30, 1961May 13, 1980) became severely ill, with symptoms including paraplegia. On May 13, 1980, Buenoano took Michael out in a canoe; the canoe rolled, and Michael, weighed down by his arm and leg braces, drowned.
In 1983, Buenoano was in a relationship with John Gentry. Gentry was severely injured when his car exploded. While he was recovering from his injuries, police began to find several discrepancies in Buenoano's background. Further investigation revealed that, in November 1982, she had begun telling her friends that Gentry was suffering from a terminal illness. 
"Vitamin pills" which Buenoano had been giving Gentry contained arsenic and paraformaldehyde. Exhumations of Michael Goodyear, James Goodyear, and Bobby Joe Morris showed that all had died of arsenic poisoning. Buenoano received substantial life insurance after each death.
Conviction, imprisonment, and execution.
In 1984, Buenoano was convicted for the murder of Michael and the attempted murder of Gentry. In 1985 she was convicted of the murder of James Goodyear. She received a twelve-year sentence for the Gentry case, a life sentence for the Michael Buenoano case, and a death sentence for the James Goodyear case. She was convicted of multiple counts of grand theft (for insurance fraud), and is thought to have committed multiple acts of arson (again, for purposes of insurance fraud).
She was incarcerated in the Florida Department of Corrections Broward Correctional Institution death row for women. On March 30, 1998, Buenoano was executed in the electric chair at the Florida State Prison. Her body was cremated.