Mark J. Sadler, age 61, of Arlington Heights, IL. Beloved son of Jerry and Geraldine Sadler; loving brother of Susan (Jeremy) Feuling and Michael (Michelle) Sadler; dear uncle of Michael A. Sadler, Adam, Christopher and Lucas Feuling, Dylan, Bella, Nicholas and Jackson Sadler and the late Tanya L. Sadler. Visitation Wednesday, March 12, 2025, 5pm to 8pm at Glueckert Funeral Home, 1520 N. Arlington Heights Road, Arlington Heights, IL. An additional visitation will be held Thursday, March 13, 2025 from 9am until the time of Funeral Mass at 10am at Saint Edna Catholic Church, 2525 N. Arlington Heights Road, Arlington Heights, IL. Interment will follow at Queen of Heaven Cemetery in Hillside.