very much like this young woman, phuong le, also vietnamese-american, also a 20-something nursing student, also living in the san francisco area. who, 13 months earlier, also disappeared. there's a lot of similarities, obviously, in that she's the same age category, same ethnicity, same profession. narrator: even the same last name. was a pattern developing? lester holt (voiceover): coming up, police look into the possible connection between those student nurses. and a meeting between police and the michelle's family. in asian families, when you're younger, you're supposed to be very, um, very respectful of the hierarchy in the family. you're not supposed to boss anybody around. but i was just livid. lester holt (voiceover): when dateline continues.