Mary Ellen Gass, born February 17, 1959 in Washington, D.C., entered rest April 12, 1998 in San Antonio, TX at the age of 39 years.  Mary was a dedicated and caring computer teacher at Lockehill Elementry School and a resident of San Antonio since 1973.  She is survived by her beloved husband, Gary Gass; daughters, Amanda and Chelsea Gass; parents Charles and Lorraine Dansevich; mother-in-law, Dorothy Gass, brothers, Charles Dansevich and Stephen Michael Dansevich; grandmothers, Ruth C. Hopper and Alice V. Potter; brother-in-law, Steven Gass; sister-in-law, Janice Achilles; and numerous nieces, nephews and friends.  Viewing will be held at the Oak Hills Mortuary Tuesday April 14, 1998 from 5:00 P.M. to 9:00 P.M.  Graveside Services will be held Wednesday April 15, 1998 at the Zion Lutheran Cemetery in Helotes at 10:00 A.M.  Arrangements with: