Who wrote the episode that originally aired April 29, 1994?
CREATE TABLE "table1_2468961_4" (
  "no_in_series" real,
  "no_in_season" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text,
  "production_code" real
);
SELECT "written_by" FROM "table1_2468961_4" WHERE "original_air_date"='April 29, 1994';