Bradley Lockhart said during an interview on NBC's "Today" show that he regrets how the decision turned out, but thought he was making the right choice at the time.
"We obviously make decisions in life that sometimes have repercussions or adverse situations that drift from our decision. We just have to continue to believe in God and hope that our decisions are the correct ones," he said.
Lockhart said he last saw Shaniya in early October as he left for an out-of-state work assignment. The girl moved in with Antoinette Davis, 25, about a week later after initially staying with Lockhart's sister, he said.
He said he spoke to Davis after she reported the girl missing Nov. 10. Police said she was killed the same day. Lockhart said he hasn't spoken to Davis since she was charged last week with human trafficking and child abuse by prostitution of her daughter.
Mario McNeill is charged with murder, rape and kidnapping.
Lockhart said he didn't think he missed any warning signs that Shaniya would be at risk if he accepted Davis's request to help raise the girl.
"I don't think I really missed any. Of course there's always speculation. There's always things you could look at and say, well maybe, maybe not," Lockhart said.
The North Carolina Child Fatality Task Force will review contacts the Cumberland County Department of Social Services had with Davis, who also has a 7-year-old son, The Fayetteville Observer reported Tuesday.
"This is a family that was already known to social service workers down there," task force co-chairman Tom Vitaglione said. "They are all very distraught about the whole thing."
The task force, a division of the state Department of Health and Human Services, will look at when local social services workers first contacted the family, what the status of the case was, and if proper procedures were followed, Vitaglione said. Investigators also will consider the impact of state and local budget cuts on social service agencies, he said.
"Child protective service divisions have been hit particularly hard," Vitaglione said.
The Cumberland County agency's director said last week releasing any information about contacts with the Davis family would jeopardize any potential criminal case.
Information from: The Fayetteville Observer