chief birdsell was there. >> when she saw me there, she appeared to be very surprised.o be there. >> but which one was arrested for the murder of stephen watkins? shirley, the matriarch, 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. [♪] check your free credit scores at creditkarma. here's to progress. hey, who are you? oh, hey jeff, i'm a car thief... what?! i'm here to steal your car because, well, that's my job. what? what?? what?! (laughing) what?? what?! what?! [crash] what?! haha, it happens. and if you've got cut-rate car insurance, paying for this could feel like getting robbed twice. so get allstate... and be better protected from mayhem... like me. ♪ we're on the move. hey rick, all good? oh yeah, we're good. we're good. terminix. defenders of home. cancer is the ugliest disease mankind has ever faced. we got the ide