Hubbard's father said his son wanted to express an apology earlier, but was advised against doing so by his counsel.
"He's been remorseful from day one," Simon Hubbard told Channel 2 Action News. "It's been a nightmare for him for the past two years, and it's probably going to be indelibly etched in his mind for the rest of his life."
Kile was critically injured in the incident, which also left his teenage friend with serious injuries. Kile, who was wearing a life preserver, was unresponsive when he was pulled from the lake and never regained consciousness. He died about two weeks later from brain injuries.
Hubbard, a family friend, was arrested March 1, 2013, after being indicted by a grand jury. Defense lawyers said Hubbard tried to avoid the children and that what happened was a tragic accident.
The wreck involving Kile came just weeks after a June 18, 2012, boat wreck on Lake Lanier that killed two young brothers.
The Prince brothers, Jake, 9, and Griffin, 13, died when the pontoon boat they were on collided with another boat, driven by Paul Bennett. Bennett was acquitted of homicide charges in November, but was found guilty of boating under the influence, reckless operation of a vessel, and failure to render aid in the deadly crash.
Bennett, 45, of Cumming, was sentenced to 30 months in prison, followed by 18 months on probation and 400 hours of community service following his conviction.