Liza Colby is a fictional character on the American soap opera, All My Children, portrayed by actress Jamie Luner from April 2009 until September 2011. She was previously played by actress Marcy Walker from 1981–1984, and then again from 1995–2005, although the role was also briefly portrayed by Alice Haining from September 1984 to 1985. Liza is a resident of the fictional town of Pine Valley, Pennsylvania.