Keller was born and raised in Regina, where he attended St. Bernadette School and Riffel High School. He joined the military reserve in 1997 and transferred to the regular army in 2000. He met his wife in 1998 while on a military course in Kingston, Ont. An animal lover, Keller supported the Edmonton Humane Society and had a big dog named Finn MacCool.
Keller's family wanted a private ceremony and declined to speak with the media, but members of the public came forward in a spontaneous gesture to pay their respects.
Keller lived in Edmonton with his wife, Sarah, and is also survived by his parents Helen and Mel and two brothers, Brad and Scott.