homicide on the north side and that the whole unit needed to respond. >> pima county sheriff's detective jennifer garcia had been in the homicide unit for all of seven months. this was a call she'd prepared for ever since she was a little girl and saw her grandfather in uniform. >> it was just something that i've always wanted to do, you know, sort of my dream job. >> and now here she was, lead detective in the biggest murder investigation in tucson. she began by methodically walking through the scene, nick's house, starting in the garage. >> immediately i noticed a bucket full of water and some carpet fibers, which at the time i thought was odd. >> inside the cabinet under the kitchen sink was open. in the living room, cleaning products left out. and in the backyard was a large pit bull.