Gregory Phillip Arnold, age 49, of Tuscaloosa was killed in an airplane crash in Canton, Miss., on Thursday, July 29.  He was preceded in death by his brother, Derrik Arnold, of Mobile.  He is survived by his wife, Ann Compton Arnold; two daughters, Audrey and Natalie; a son, Daniel; his mother, Mari of Mobile; and a sister, Laurie Hasenfus of Northridge, Calif.  Visitation will be in Tuscaloosa at Canterbury Episcopal Church on Monday, Aug. 2, at 3 p.m. Funeral services will be held at Trinity Episcopal Church in Demopolis on Tuesday, Aug. 3, at 11 a.m.