He was born June 24, 1943 to John Siegel and Virginia Martha (Poage) Montgomery, in Smithville, MO. Gary grew up in Smithville and graduated from Smithville High School in 1961.

He met the love of his life at Hallmark Cards and was united in marriage to Charlotte Fleming March 2, 1962. After their marriage they lived in Kansas City, MO and later made their home in Smithville, MO. 

He owned his own tire business C&G Tire before his retirement.

He was preceded in death by his parents, his two brothers Roger Dean and John Kenneth, three sisters Barbara Tommey, Carrol Cansler and Marlena Wulff. 

He leaves behind his wife of 60 years, sister Dixie (Roger) Blake, son Richard Dean (Diana) Montgomery of Kansas City, MO, daughter Cynthia Jean (Guy) Carter of Independence, MO, grandchildren Linda Piemonte (Aaron), Elizabeth (Liz) Piemonte, Stephen (Danita) Brooke, Katherine Burr (Chris), Great grandchildren Gavin Brooke, Ryker Brooke, Makenzie and Hunter Brooke. Several nieces, nephews and extended family and many friends.

Celebration of Life 6:00-8:00 p.m. Monday, December 19th at Hixson-Klein Funeral Home, Smithville, MO.