After Sapir 's death , Murray continued the series until the late 1990s .
In the late 1980s , Will Murray took over the sole responsibility of writing the series , having written several previous books with either Murphy or Sapir .
After Sapir 's death , Will Murray continued the series until the late 1990s .
In the late 1980s , Will Murray took over the sole responsibility of writing the series , having written several previous books with either Murphy or Sapir .