Jack was the driver of a charter bus that drove the group to many of their concerts.
After falling in love and marrying the pair managed the company V-K Bus Lines. They have two sons.
The couple travelled the world, venturing to Europe and Australia.
Sadly, about a year ago, Harriett fell over while walking the coupe's dog, breaking her hip and pelvis.
Harriett suffered from dementia and moved into a nursing home and rehabilitation centre.
While she was in care, Jack struggled to live at home by himself before being talked into moving into a villa at the home where his wife lived.
Jack and Harriet Wagner. Photo / NBC
In September, he also suffered a fall, breaking his neck. He then moved into the nursing home and stayed four doors down from his wife.
The couple would often nap together, one in a wheelchair, and the other in their bed while holding hands.
On Christmas eve Jack was told his wife had stopped eating and drinking. Just days later he also stopped eating and drinking.
At about 11pm on January 10, the nursing home told Jack that Harriett was close to her death.
Nurses moved the pair into the same room. The next day, both Jack and Harriett passed away just hours apart.