The 48-year old nurse's aide, Cindy Krantz and Kirkersville Police Chief Eric Disario were also shot to death by the gunman.
According to 10tv.com and the Newark Advocate, Hartless was sentenced on March 23 to 90 days in jail on misdemeanor domestic violence charges involving three attacks on Medrano - in December, January and March.
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Thomas Hartless, 43, fatally shot a Kirkersville police chief and two nursing home employees Friday. Of those 64 guns, there were 21 shotguns, 20 rifles, 18 handguns, three airguns and the rest were not specified.
He was not allowed to possess or own a firearm because of his 2010 felony conviction for abduction in Knox County, the newspaper reported. Judge Michael Higgins said new procedures have been put in place after multiple errors were made in the release of Hartless on April 11.
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In a letter to authorities during Hartless's sentencing, Medrano said she still loved Hartless and wrote, "I never intended Tom to be jailed for his actions, rather it was a cry for help". "With intense therapy, medication compliance and lifestyle changes, I am most confident we can and will overcome our struggles".
A Filipina was among the nurses killed at a nursing home shooting incident last week in Ohio.
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The family of a 48-year-old mom of five children is in mourning this Mother's Day weekend, after her slaying at the OH nursing home where she was a nurse's aide. Authorities say Medrano obtained a protection order against Hartless a week before he killed her. His funeral service will be held Saturday in Grove City.