(Eaton, OH)--The Eaton woman who drowned her own 93-year-old grandmother in a kitchen sink late last year was sentenced yesterday.  Heidi Matheny was sentenced to life in prison.  She won’t be eligible for parole until 2037.  Matheny appeared by video yesterday from jail and did not address the court.  Here’s Prosecutor Martin Votel after the sentencing:  "To this day, the granddaughter has never been able to consistently explain to my satisfaction or to the satisfaction of law enforcement why this happened and why she felt she needed to do that.  It really is the definition of senseless."  Matheny had pled guilty to the murder earlier this month.