>> todd kohlhepp shot charlie carver three times in the chest and wrapped him in a blue tarp. put him in the bucket of the tractor. locked me down here, and i never seen him again. okay. he says he's dead and buried. he says there's several bodies dead and buried out here. and he says that the dogs will be ruined if they go looking because there's red pepper. >> coming up. the shocking moment. detectives take a serial killer into custody. and the cold blooded confession that closes the book on the superbike motorsports killings and three other murders. >> have you k led anybody else? is that enough? >> lunch is on me today. >> awesome. why? >> i have some extra cash right now. i started using upside, the free app that gives you cash back for every gallon of gas you buy. >> wait, are you saying you get real money back when you get gas with the upside app? yes. >> i get real cash back every time i get gas. >> does that actually add up to anything? >> i'll make around 200 to $300. >> wow. that's serious. extra cash, right? >> you're putting gas in your car anyway. why not get rea