. >> they identify colin rideout and alexander rideout. >> reporter: the victims two sons? park with his 19 year old brother alex, who had just graduated from high school. investigator bolton pulled out his iphone, pressed record, and he and another investigator began to ask the brothers some questions. younger brother alex was first. >> what's going on? when your brother out for a walk? >> yeah, basically that's -- i, mean we were just, like out, and then people shot but it's like, well that's -- i've never really encountered police before, so it was like -- >> you've never been in trouble before? >> no, i -- i don't really do drugs, or drink, or party. >> how old are you? >> i'm 19. >> reporter: investigator bolton 's radar was up. he knew craig thought one of his sons might be behind that we are break-in, and now, here were his sons acting suspiciously in a secluded park. the investigator decided to ask what they thought happened to their dad, but without telling the boys that craig had already been found brutally murdered. >> he always said, i could just disappear. and