Discovery Communications is pushing deeper into scripted programming with TLC working with Tyler Perry, whose series have helped turn around OWN, its joint venture with Oprah Winfrey. At an upfront presentation in Chicago last week and a press briefing in New York Thursday, Discovery, best known for its reality programming, announced it will also take scripted looks at the stories of the Unabomber on Discovery Channel and O.J. Simpson on Investigation Discovery. Jon Lafayette has the story.