BURLESON — Bobby Preston "Papaw" Riley, 75, a retired machinist, passed away Sunday, March 28, 2010, at home surrounded by his loving family.        Funeral: 10 a.m. Thursday at Hector First Assembly of God in Hector, Ark. Visitation: 6 to 8 p.m. Tuesday at Mayfield Kiser Funeral Home and 6 to 8 p.m. Wednesday at Humphrey Funeral Service in Russellville, Ark.        Bobby was born June 22, 1934, in Hector, Ark., to Cecil and Drucilla Riley. He served in the Army at Fort Hood, where he met his wife of 43 years. He loved the outdoors, but most of all he loved spending time with his children and grandchildren.        Bobby was preceded in death by his mother; brother, Bennie; and wife, Joyce.        Survivors: Children, Martha Howard (John), Bobby Don Riley (Sharlotte), Michael Riley and Michelle Hunt (Michael); grandchildren, Michael Jay, Amanda, Rachel, Bill, Jesse, Benji, Vanessa, Sabrina and Curtina; great-grandchildren, Dalton, Dakota and Rylee; two sisters; four brothers; and many nieces, nephews and friends.