"Snip" http://www.cnn.com/CNN/Programs/nancy.grace/ Putnam County Sheriff declares Haleigh is "likely deceased, Cops announce the Haleigh investigation is now homicide. And in a Nancy Grace exclusive, Misty Cummings' grandmother says Misty told her Haleigh was tied with rope and concrete block, then dropped into the river police have been searching. Is an arrest imminent? Police now have several undisclosed persons of interest and say sources are cooperating. Nancy Grace has the latest breaking developments, 8 and 10p ET on HLN.