Mark D. Fortnum Sr. passed away on January 12, 2022 at the age of 66. Longtime partner of Linda Bianco. Father of Mark D. Fortnum Jr. and Allan Fortnum (Tiffany) and Dina McLeer (Scott) and James Revere (Heather). Grandfather of Aiden Fortnum, Ethan and Mia McLeer and Cristal and Hunter Revere. Brother of Bruce Fortnum (Joann), Alda Fox (Joe), and the late Walter Fortnum (Kathy). He is also survived by his grand-dog Icarus. Relatives and friends are invited to greet his family on Tuesday beginning at 11 AM. A Funeral Service will follow at 12:30 PM at Koller Funeral Home, 6835 Ridge Ave. Interment Private. In lieu of flowers, donations in Mark's memory may be made to ALS Foundation https://www.als.org/donate The family is requesting that anyone attending Mark's services please wear a mask.