Minnesota Senate Candidate's Grandfather Suspected in Four Killings

• John Jacob Hartmann, grandfather of Minnesota Senate candidate Peggy Flanagan, was suspected in four killings.
• Hartmann spent decades in psychiatric care, according to old newspaper accounts and court documents.
• The allegations about Hartmann's past have surfaced during Flanagan's Senate campaign.
• The impact of Hartmann's history on Flanagan's campaign remains unclear.
• Reports detail Hartmann's troubled mental health history and suspected criminal activities from decades ago.