MAN KILLS PARENTS BEFORE TAKING OWN LIFE IN MADISON COUNTY MURDER-SUICIDE, DEPUTIES SAY. (PHOTO)

 Man kills parents before taking own life in Madison County murder-suicide, deputies say

 A 35-year-old man fatally shot his parents before taking his own life at their home in Madison County, New York, authorities said.

Steve M. Sislo, 76, and Donna M. Walker-Sislo, 72, were found dead Friday morning at their home on McCormick Road in the town of Madison. Their son, Justin Sislo, was also found dead inside the residence.

Deputies were sent to the home shortly after 9 a.m. for a welfare check after the couple's other son, Jordan, called 911. He told dispatchers he had not heard from his parents or brother since Monday.

When the first deputy arrived, they detected a strong odor of propane and could hear gas escaping from inside the home. Looking through a window, the deputy saw two deceased adults. Deputies entered the residence and discovered a third person who was also dead.

A firearm was recovered at the scene.

Authorities determined that Justin Sislo had shot and killed both of his parents before shooting himself. Investigators had not determined exactly when the killings occurred.

According to emergency dispatch information, Jordan told authorities that Justin had been staying with his parents and that there had previously been a history of domestic incidents involving Justin and his parents.

The investigation into the deaths remains ongoing.