Martell of Lowell, formerly of Billerica, unexpectedly from an accident, July 24, 2011, Sandra L. Martell, age 49. Beloved daughter of Joanne C. (McInerny) Martell of Pepperell and William Martell, Sr. of Newbury and Billerica. Loving sister of Sheryl Gillis and her husband John of Lowell, William Martell, Jr. of Billerica, Karen Fontes and her husband John of FL, Laurie Sullivan of Pepperell and her fiancé Steven MacDonald, and Christopher Martell of Townsend. Also survived by her goddaughter, Hollie Lorenzo, and many nieces, nephews, and grandnieces and grandnephews. Sandra will be greatly missed by her many family members and friends. Memorial contributions may be made in Sandra's name to the Lowell Humane Society, 951 Broadway St., Lowell, MA 01854. At the request of the family, all services will be private.