you can't help but ask yourself. >> the jury will be asking. >> you would imagine. >> the jury would soon get its chance. more than ten months after stephen watkins was shot to death, an arrest in florida where shirley and jennifer had gone to live with baby sydney. chief birdsell was there. >> when she saw me there, she appeared to be very surprised. i was happy to be there. >> but which one was arrested for the murder of stephen watkins? shirley, the might arc, or jennifer, the mom embroiled in a custody battle? coming up, it turns out one of them had strange marks on her hand the night of the murder. >> two lines? >> two lines. >> consistent with firing that type of weapon. >> consistent with firing this type of weapon. >> when "dateline" continues. what color did you paint your room? the moment you realize you didn't really mean "any color you want." we want you to feel great about your color choice. that's why we have a paint guarantee.