Dad decides he won't walk daughter down the aisle on her wedding day

Most fathers look forward to the day when they can walk their daughter down the aisle on her wedding day. Mark Williams, however, won't be walking his daughter down the aisle -- and the reason why is truly touching.

On Christmas Eve in 2009, Mark and his wife Michelle received horrible news that their 4-year-old daughter, Chloe, had cancer.

"I remember going to the family's room on the 24th of December to have to tell them their daughter had a brain tumor," said Dr. Alex Levy, a childhood cancer specialist at the Arnold Palmer Hospital for Children in Orlando, Fla.

Williams asked Levy if he would ever get the chance to walk his daughter down the aisle.

In a 2012 video from the hospital, which recently resurfaced, the heartwarming reason for Williams' decision is explained.

Click here to watch the video.