about the case. he shared an emotional moment with lisa's sisters and her mother, tracy. >> the first thing -- seth grabbed the girls and hugged the girls and we all hugged seth, you know, told him we loved him. >> when investigators finished their forensic work inside the trailer, tracy, seth, and his parents went out there to retrieve some of lisa's things. >> it was very tough. i was just amazed, the way it looked. >> crime scene techs have been all over it, hadn't they? >> all over it. i guess i went into dad mode and tried to protect seth a little bit. and i -- i wanted to cover up the bed. >> what was your thinkin'there? >> i just didn't want him to see the blood. >> how was your boy dealin'with all this, in these hours after? >> i think he was just shocked. >> that sunday wasn't a day of rest for the men and women trying to solve the crime either. investigators were focusing on the murder weapon, and were working a lead on a 12-gauge mossberg shotgun. it belonged to seth's friend,