1994 New Canaan High School graduate David Burns is participating this coming Sunday in a special fund- and awareness-raising walk for a very personal reason. Burns, a tennis standout here in town who is now a 40-year-old father of two, was diagnosed last Novemeber with a life-threatening liver disease, and received a transplant in January at UCLA hospital. He’s participating in Liver Life Walk Los Angeles 2015. Together with sisters Mollie and Eliza, their team—the Healthy Hedgehogs—has raised more than $10,000 for the 5K walk, an important fundraiser for the American Liver Foundation. And he’s doing this within months of his surgery.