After more questioning , Kellerman appears to give up .
Kellerman ends the interview , but as Kellerman goes to leave , Kellerman springs Kellerman 's trap , casually asking Robb Kellerman he had killed the dog .
After more questioning , Kellerman appears to give up , and he ends the interview , but as he goes to leave , he springs his trap , casually asking Robb why he had killed the dog .