. >> reporter: ank lena had a lot to tell the detectives about frank's final days, about what and why. >> we're gonna start from the beginning. >> reporter: angelina said after his trip on the bus to angel gate, frank got sick with what they both thought at first was stomach flu. >> it wasn't like a constant. it was like, maybe once every half hour, he'd throw a little bit up, a little bit up. >> reporter: but then frank got so sick that angelina took him to the er. the doctor said all frank needed was rest and fluids and he'd get better. but two days later frank was dead. and angelina now told detectives she didn't believe it had been the stomach flu at all. she thought something happened to frank on that trip to angel gate. >> was he feeling okay when he went up? >> oh, yeah. >> reporter: angelina said she had urged him not to chaperone the students and not to go back to angel gate. >> did you tell him before you went? were you concerned? >> oh, yeah, we argued. i said, please don't go. >> reporter: she was worried that frank, who was so trusting, wouldn't be safe. >> i mean, he loo