input: from typing import List, Tuple
  
  def fetch_horror_movies_from_db(db_name: str) -> List[Tuple]:
      """
      Connects to a SQLite database, executes a query to fetch all movies in the
      'horror' category, and returns the results as a list of tuples.
      
      >>> fetch_horror_movies_from_db('movies.db')
      [(1, 'Scary Movie', 'horror', 2000), (2, 'The Exorcist', 'horror', 1973)]
      """
      import sqlite3
      
      conn = sqlite3.connect(db_name)
      cursor = conn.cursor()
      
      cursor.execute("SELECT * FROM Movies WHERE category = 'horror'")
      result = cursor.fetchall()
      
      conn.close()
      return result
output:     import sqlite3
      
      conn = sqlite3.connect(db_name)
      cursor = conn.cursor()
      
      cursor.execute("SELECT * FROM Movies WHERE category = 'horror'")
      result = cursor.fetchall()
      
      conn.close()
      return result