he was tightest with another exchange student. this one from ecuador. robby pazmino. >> we had so many things in common. the same personality with the same wishes and dreams. >> they were a package deal. >> you see one, you're gonna see the other? >> oh, yeah. >> reporter: saturday, april 26, was no different. the boys spent the evening playing video games and listening to music in randy and kate's basement. >> i went down 10:30 or so that night and told them maybe crank the music volume down a little bit. >> reporter: but around midnight, diren was bored, restless and suggested he and robby take a walk. >> and i was kind of, "i'm just really tired, diren." he was like, "come on." and i was like, "okay." >> reporter: so while kate and randy slept upstairs, robby and diren slipped out the back door for a walk around the neighborhood. they headed up the nearby hill and then turned on to deer canyon road.