. >> reporter: emt stephanie robertson was the first responder on the scene. she checked on jaime. he was clearly dead, huh? >> yeah, clearly dead. yeah. >> reporter: you know, gunshot wounds from knife wounds. >> you couldn't really tell, there was so much dry blood. i did notice the gash down his neck. >> reporter: next, emt robertson found her way to sandra, by then collapsed on a chair in the bathroom, a family member by her side. >> she was kind of balled up a little bit. and she was crying hysterically. >> reporter: the emt started to assess sandra, who said her head hurt, but -- >> she said she has no injuries. >> reporter: still, sandra seemed disoriented. what time was it? morning or afternoon? then, between gulping sobs, sandra said she simply could not remember what happened the night before. she'd been unconscious -- maybe had one of her seizures. >> she said after a seizure, that it's not uncommon that she falls asleep for several hours. >> reporter: by now, harris county sheriff's investigators had descended on a crime scene that was once just the melgars' modest home