David A. Walker, 57    FALMOUTH -- David A. Walker, 57, died unexpectedly on Sunday, July 30, 2006. He was born April 7, 1949, in Milwaukee, Wis., a son of Bernard and Vivian Rhines Walker.     He served in the US Navy for 4 years.     On April 12, 1969, he married Brenda Bye at Sacred Heart in Yarmouth.     David worked for Burnham and Morrill for 39 years and for the last 10 years as a purchasing agent for the maintenance department.      He was a Past Commander of American Legion Post #164 in Falmouth, a member of VFW Post #832 in South Portland, the Windham Wheeler ATV Club, Standish-Gorham ATV Club and the North American Hunting Club. David was quite the outdoorsman and enjoyed riding his ATV, hunting, fishing and camping.      He was predeceased by a brother, Bruce Walker. Surviving are his mother, Vivian Lawrence and her husband Philip of Eustis; his beloved wife, Brenda; a mother-in-law, Alice Bye of Falmouth; two sons, Scott and his wife Stacey Walker of Gray and Brent and his wife Nicole Walker of Gray; brother, Richard Walker and his wife Shelly of Defuniak Springs, Fla.; a sister, Sharon Parker and her husband Donald of Windham; a brother-in-law, Dennis and his wife Michele Bye of Montville; a sister-in-law, Janice Hulit of Windham; six grandchildren, Sonya Walker of Scarborough, Brendan McNally, Brooke Walker, Brett Walker, David Walker and Angelique Walker, all of Gray; and several nieces and nephews.     A Memorial Service will be held at 10 a.m., Friday, Aug. 4 at Jones, Rich and Hutchins Funeral Home, 199 Woodford Street, Portland. Burial will be at Blanchard Cemetery, Falmouth.    David A. Walker    Jones, Rich & Hutchins     Funeral Home & Cremation Service    775-3763