Donald J. Mahar, 81, of Venice, passed away peacefully on March 17, 2026.

Born on March 21, 1944, in Albany, Donald was the son of the late Donald A. Mahar and Patricia (Turner) Mahar. He was raised in Defreestville alongside his beloved sister, Marilyn Crowther.

Donald proudly answered the call to serve his country, enlisting in the United States Marine Corps in 1963. He deployed to Vietnam in 1965 and served honorably during a defining period in our nation’s history. He attained the rank of Sergeant before being honorably discharged in 1967. His service reflected a lifelong commitment to duty, resilience, and quiet strength.

On June 22, 1968, he married the love of his life, Diane Hislop. Together, they built a life grounded in devotion, partnership, and enduring love that spanned nearly six decades.

Donald dedicated more than 30 years of service to the State of New York, where he built a respected career and lasting friendships. Beyond his profession, he gave generously to his community, coaching youth sports and serving as an umpire for high school girls softball and recreational leagues. He was a steady presence, a mentor, and a positive influence to countless young athletes.

A proud Irishman and devoted family man, Donald was a lifelong and passionate fan of the New York Yankees. He enjoyed watching them at every opportunity—especially during the championship seasons of 1996, 1998–2000, and 2009.

He was predeceased by his parents, Donald and Patricia; his son, Kevin; and his daughter, Shannon.

He is survived by his loving wife, Diane; his daughter, Colleen, her wife Amy, and their children, Kasey and Stan; his son, Colonel Todd Mahar, United States Marine Corps, his wife Amy, and their children, Evan and Callee; his cherished sister, Marilyn Crowther; and many beloved nieces and nephews.

Donald will be cremated, and his ashes will be interred at Gerald B.H. Solomon Saratoga National Cemetery at a later date.

In lieu of flowers, donations may be made in Donald’s memory to the Cure Alzheimer's Fund.

Though not as lean or as mean as in his youth, he left this world as a proud United States Marine and has taken his post on Heaven’s scenes. His life was defined by service—to his country, his community, and above all, his family—and his legacy will live on through all who knew and loved him.