just two days to tie rosendo rodriguez to summer baldwin's murder. >> i guess of the things i've learned on this case are that the smallest piece of evidence sometimes can come out to be or make the biggest difference in a case. so you never overlook anything. >> it came back to that upc code inside that suitcase that tracking code and that's what led to everything. >> based on the evidence, prosecutors believe rodriguez picked up summer baldwin and they went to the holiday inn hotel. they had sexual relations and at some point, there was an argument that turned violent. >> the money you're going to pay me. >> the forensic evidence shows rodriguez can he beat summer until she was unconscious. blood spatter hit the floor.