MILLBROOK — A Millbrook man has pleaded guilty to first-degree manslaughter in connection with the 2021 killing of his teenage sister inside their family home, Dutchess County District Attorney Anthony Parisi announced Thursday.
Mark Dedaj, 34, pleaded guilty in Dutchess County Court to a Class B felony, admitting that he caused the death of his 17-year-old sister, Maureen Nelson-Lanzi, by holding her face down into a pillow on a bed until she suffocated.
The incident occurred on Sept. 4, 2021, at their residence on Harts Village Road.
“This was a brutal and heartbreaking act of violence within a family,” Parisi said in a statement. “Our office made the deliberate decision to take action, because the loss of this victim’s life demanded accountability. This plea holds the defendant responsible for his actions, ensures a measure of justice, and spares the victim’s loved ones the pain of reliving this tragedy through a trial.”
Dedaj is scheduled to be sentenced on March 26, 2026. Under the terms of the plea agreement, he will receive 25 years in state prison followed by five years of post-release supervision.
