once again, elizabeth vargas. >>> reporter: it took six long years, but katherine underwood realizes she's bankrolled the dreams of budimir drakulic. in return, she got an empty promise and an empty bank account. >> i felt stupid. >> reporter: katherine decides to go on the offensive. she's begins to take a closer look at budimir and his story has some holes in it. first at ucla. >> i found out he had left ucla in october of 1993. he was not a professor at ucla. >> reporter: and what about all those late nights working at edwards air force base? katherine says a late night phone call in 2000, woke her up in more ways than one. >> i looked at the caller i.d. -- >> mm-hmm. >> -- and it was a los angeles number. >> he wasn't calling you from the desert? >> no. well, then i knew i was in big trouble. >> reporter: the next day, a devastated katherine flies to l.a unannounced. she recalls the time budimir first showed her around the ucla campus and him talking about playing tennis. so, grasping at straws, she heads to the tennis courts. >> he was playing tennis. he was taking a tennis lesso