Murdered Minnesota man was rolled up in a rug & dumped in the woods. Why was no one looking for Gary Herbst?

In the summer of 2013, Minnesota resident Gary Herbst seemingly vanished. But before anyone realized he was missing, neighbors noticed something strange: late one night, they watched a rolled-up carpet being carried out of his home. Years later, investigators would uncover a startling discovery that revealed what really happened. In an exclusive interview, "48 Hours" correspondent Peter Van Sant speaks with Gary Herbst’s son, Austin Herbst, about why he killed his father in "What the Neighbors Saw."