>> we came here a lot when she was little. >> heather collins doesn't want to think any more about isaiah hagan. she comes to this park to think about halee, the good times they had here as a young family, and the woman halee could have been. >> i don't think that we have -- any of us have come to terms with what happened yet. and that she is really gone. you think that she is just going to come walking back in the door to pick up her laundry. >> emilee finds herself picking up the phone to call her big sister, only to have the sad reality come crashing down, only to be left with one sad, unanswerable question. why did isaiah do it? >> i wonder how he could do something like that. and what made him do that? why was he so desperate to hurt someone so kind? and there is no one that could say she wasn't the most giving person. so why wouldn't you just ask?