it escalated a lot after -- i mean, with the controlling issue it escalated from there. >> jessica del rocco could wear and who she could have as friends. del rocco says clark sometimes got so angry she was frightened. >> in a matter of weeks jessica says clark went from the perfect boyfriend to becoming manipulative, controlling. >> it was anger, yelling. as the relationship progressed, like if things didn't go his way, then he'd make them go his way. >> good evening. i'm nancy grace. i want to thank you for being with us. bombshell tonight. was 5-year-old haleigh taken to a late-night party fueled by drugs where she ingested the heavy-duty painkiller oxycontin? >> i know i didn't do anything to that little girl. i would never hurt her. i mean, they love me. i mean, they look at me like their mom. >> did haleigh cummings die from an overdose of oxycontin? a letter obtained allegedly from a friend of misty croslin claims that haleigh got her hands on the powerful narcotic while at a party with misty and her friends the night of the disappearance. >> now that you have been told, whether you a

issue it escalated from there. >> jessica dell rocco tells abc's "good morning america" clark told her what clothes she could wear and who she could have as friends. del rocco says clark sometimes got so angry she was frightened. >> in a matter of weeks jessica says clark went from the perfect boyfriend to becoming manipulative, controlling. >> it was anger, yelling. as the relationship progressed, like if things didn't go his way, then he'd make them go his way. >> good evening. i'm nancy grace. i want to thank you for being with us. bombshell tonight. was 5-year-old haleigh taken to a late-night party fueled by drugs where she ingested the heavy-duty painkiller oxycontin? >> i know i didn't do anything to that little girl. i would never hurt her. i mean, they love me. i mean, they look at me like their mom. >> did haleigh cummings die from an overdose of oxycontin? a letter obtained allegedly from a friend of misty croslin claims that haleigh got her hands on the powerful narcotic while at a party with mist sxwri her friends the night of the disappearance. >> now that you have been told, whether you accept it or not, that your wife has flunked a pol

>> the relationship started out, according to jessica del rocco, very sweet.en it progressed over a period of three months where he became more and more controlling, nancy, and would tell her what to do, would tell her what to wear, how to act, when to speak, when not to speak. >> you know, to you, dr. caryn stark, psychologist, telling her what friends to have, what to wear. he said, you talk too softly, you breathe too loudly. >> well, it's typical of somebody who's a control person, nancy, that he feels out of control inside, so he needs to control everything around him, including the person he's with. and somebody who's like that with a woman doesn't feel good about himself as a man. so he keeps trying to refine her and get her to be the way he thinks she should be. >> so how does that fit into this case, mike brooks? >> nancy, i think what they might be trying to show is a pattern of prior behavior. you know, if this is -- is this the way he was there? is this the way his controlling -- his controllingness was in the lab with all these ph.d. candidates, w

he was also territorial when it came to the lab and the mice he took care of. >> jessica del rocco tellingry angry often. >> frighten you? >> yeah, he would frighten me. >> you are seeing raymond clark's former girlfriend, jessica del rocco on abc's "good morning america." out to jean casarez, legal correspondent "in session." these are pretty stunning developments. also, we learned police back at the scene today. >> that's right. new haven police, they went back to the lab building. the building is open for research and investigation. they, though, went down to the basement. they went to a washroom, nancy, and it had lab technicians right in it, asked them to get out. cordoned it off as a crime scene, saying they were looking for what could be potentially important evidence. >> i want to go to rupa mikkilineni, our producer on the story. rupa, the girlfriend, the former girlfriend that speaks out saying that clark, when she was with him, was manipulative, controlling, but how did the relationship start off? >> the relationship started out, according to jessica del rocco, very sweet. he wa

here's jessica del rocco talking about their relationship on abc's "good morning america". >> started to get a little controlling in the fact where it was what i could and couldn't wear and where i couldn't go and how i should speak and like stuff like that and just from there it just escalated. you know, it's don't go here, don't be friends with these boys and these girls are okay and, you know, you're talking to much or you're not talking loud enough. >> now, investigators are going back to the scene to that campus lab where they found annie le's body stuffed in a wall, nearby bloody clothes tucked into the ceiling tiles. but is this an open/shut case. joining me lieutenant steve rogers commander of a criminal investigation division at the nuttily police department. starting with this new information police and investigators are returning to this lab. my assumption is that was a crime scene, possibly no longer a crime scene yet back at it. what do you make of that. >> well, they are probably going to look for new evidence, new leads. perhaps there's marks on walls that certainly wil