Mother's Day Murder Mystery

Stacey Burns was a mother of five and a well-liked school nurse in the picturesque town of Wolfeboro, New Hampshire. Burns "always made you feel good," said a friend, Sonya. Burns, she said, "always had a hug for you. Always had a laugh, a smile." Watch the full story on "20/20" Friday at 10 p.m. ET. (Courtesy Michael Keane)