BUFFALO, N.Y. (WIVB) — A Lockport man has pleaded guilty and will be sentenced to 20 years to life in prison for murdering his sister in 2023, the Niagara County District Attorney's Office said Friday. David Fermoile, 65, killed his sister, 68-year-old Diane Fermoile-McAvoy, at a home on Windermere Road on June 7, 2023. The woman was found dead after officers were called to the home to perform a welfare check after a visiting nurse was unable to make contact with a patient at the home. Fermoile and his 98-year-old mother resided at the home. Fermoile pleaded guilty to second-degree murder. He will be officially sentenced on Dec. 11. Latest Local News Everhaunt getting visitors into the Halloween spirit and doing it for a cause Lockport man pleads guilty to murdering sister Refunds secured for tourists who had hotel stays canceled before eclipse Photos: Northern Lights paint the skies of Western New York Fire breaks out at apartment building in Hamburg Aidan Joly joined the News 4 staff in 2022. He is a graduate of Canisius College. You can see more of his work here.