Brookelyn Farthing vanished on June 22, 2013.
Robert Bates said his accidental 2015 shooting of Eric Harris "keeps me up at night. I can't sleep."
Floods swept away cars and cut power to thousands after 10 inches of rain over 24 hours fell in some parts of the state.
Officials were still searching Saturday for missing people in Greenbrier County, the area hardest hit by the floods with 15 deaths.
A 6-year-old boy playing with a gun accidentally shot his 4-year-old brother in the head in their New Jersey home Saturday morning, authorities said.