How did Final Vision pull off its brutal murder scene?

Based on the book Final Vision: The Last Word On Jeffrey MacDonald by Joe McGinniss, the new Investigation Discovery true-crime movie Final Vision centers around Jeffrey MacDonald, better known as the Green Beret Killer, a man convicted of murdering his pregnant wife and two daughters in 1970. The film doesn’t hold back when it comes to depicting the murder scene—it’s pretty brutal. In the video above, Scott Foley, who portrays MacDonald, talks about the challenges of filming the scene.