Graney said Bruce was in charge of the organization's finances but has cut off contact with her.
Bruce didn't return repeated telephone messages from The Associated Press, including one left with his sister. Public records list Bruce's address as an apartment in a gated complex on the southern outskirts of Nashville. No one answered the door there Friday afternoon.
An online biography lists Bruce, an endurance athlete, as co-founder of Nashville-based X3 Endurance, a fitness training company, which had a link to the foundation on its website. But Eddie Ferrell, another co-founder of that company, said it ended its relationship with Bruce almost a year ago and his whereabouts are unknown.
The idea behind the 26.4.26 Foundation was for runners to participate in marathons, raising money for each of the 26 miles they ran and dedicating each mile to one of the 26 victims of the school shooting — 20 children and six educators. The fundraising effort was featured in Runner's World magazine and was the subject of several local news stories.
The group held its first marathon in Nashville a week after the shooting, with more than 1,000 participants. Another was held in New Hampshire last April. More than 1,400 runners raised about $22,000 for the foundation, organizers said. The charity also received donations from runners in other events, Graney said.
Graney said she noticed something was amiss last spring, when she discovered suspicious charges to the foundation's PayPal account.
"I saw there was $1,200 billed for paddle boards," she said. "I went on (Bruce's) Instagram page, and he had posted a picture of a paddle board in the back of his truck."
Graney said she confronted Bruce and he promised to meet her and go over the organization's finances. She said he never showed up and then cut off contact with her in September.
She said she filed complaints with the FBI and the Tennessee attorney general's office, which said they don't comment on ongoing investigations.
Graney said the foundation, registered as a nonprofit corporation in Tennessee, had virtually no overhead or other expenses that would justify not giving the vast majority of the proceeds to the people of Newtown.
"I am in tears, sick about this," Graney said by telephone Friday.
The attorney general's office in Connecticut, which has been keeping track of charities that sprang up after the shooting, said it had no knowledge of the foundation.
The NYA's executive director, Dorrie Carolan, said her organization "graciously accepted a check in the amount of $30,000, which cleared shortly after it was received."
Leigh Melia, who lives in Lebanon, 70 miles east of Newtown, ran 3 miles of the New Hampshire race as part of a relay team with a group of teachers and her then-7-year-old daughter. She said each mile was dedicated to a different Sandy Hook victim and she explained to her daughter who they were as they ran.
"When I ran, I thought the money was going to those victims and their families," she said, adding she feels someone should be held accountable now that the money has gone missing.Graney said her hope is publicizing the problem will help get the money to where it belongs.
"If I knew what was going on, I would have stopped it sooner," she said. "I feel terrible. I couldn't sit by and let this happen."
Associated Press writer Travis Loller in Nashville and researcher Jennifer Farrar in New York contributed to this report