Catherine: Our two cases have become one.
Grissom: Could still be two cases.
Catherine (smirks): Whatever happened to Mr. No-Such-Thing-As-Coincidence? "The simplest hypothesis is usually the correct one." "If you hear hooves think horses, not zebras."
Grissom: What would the horses be in this case?
Catherine: Murder/suicide. Jill killed Amanda, and then felt guilty and killed herself.
Grissom: And what've you got to support that?
Catherine: Did you notice any photos of Amanda or Amanda's family at Jill's house?
Catherine: Right. And I looked through Amanda's phone book and Jill was not even in it.
Grissom: Well, maybe she had her number memorized.
Catherine: Brass spoke to Jill's attorney for next of kin... nonexistent. She's leaving a small fortune to various charities. Sounds to me like estrangement. (Grissom makes a face) Okay, even if that wasn't the exact way that it went down I'll bet you a dollar that the twins deaths are related.
Grissom: Two women found dead on opposite sides of town, if they didn't look alike would you still link them?
Catherine: If they're relatives, yes. Sisters, husband and wife, father and son.
Catherine: Okay, what?
Grissom: I'll take the bet.