Mr. Leonard J. Kantowski, Jr. of Grafton, New Hampshire died Sunday April 11, 2004 in Emerson Hospital, Concord. He was 44. Born in Waltham, a son of Anita G. (LeBlanc) Malvey of Littleton and the late Leonard J. Kantowski, he was a self employed carpenter. He also leaves his wife, Robin (Coutermarsh) Kantowski; his children, Leonard J. Kantowski III and John M.J. Kantowski, both of Grafton; one brother, Eugene Kantowski of Manchester, NH; five sisters, Mary Kantowski, Liz Distasio, Melissa Morse, all of Acton, Diane Joyce of Danvers and Laura Beltrami of Littleton and many nieces and nephews. Funeral services under the direction of the Joyce Funeral Home, Waltham will be private. Memorial donations can be made to the American Heart Association, 20 Speen Street, Framingham, MA 01701.