pam butler's valentine's day no-show in 2009 was completely out of character. he days after her family reported her missing, washington, dc's metropolitan police looked for clues inside pam's home. they scoured the house for physical evidence. dennis murphy (voiceover): peter newsham, dc's former chief of police, was running investigations when detectives began probing pam butler's disappearance. it was a hard case. this was a young woman. by all accounts, she was beloved by her family. she was-- she kind of kept to herself in her neighborhood. her employee, her described her as being one of these folks that was always came to work, very reliable. she would always let her family know where she was going to be at any given time. dennis murphy (voiceover): his investigators found no sign of forced entry, no sign that pam had been in a struggle, and no sign at all of what might have happened to her. if we had information to suggest that pam was in a particular location, we could go and search that area and maybe find something. that didn't happen in this case. denn

we now have pam butler missing. young lady who has a young daughter herself, we decided we had to seek an arrest warrant for jose. there's urgency to get him on ice, right. no, for sure. for sure. dennis murphy (voiceover): coming up, is derrick still a suspect? i said, oh, lord. i'm thinking that they're coming to lock me up at 3 o'clock in the morning. - knock, knock. come along. yeah, he said, this is detective fulton. i said, yeah, what's going on? dennis murphy (voiceover): when "dateline" continues. >>> hi, i am richard lui with a weather update. northern minnesota into upstate new york by the great lakes region is experiencing a lake effect snow event that is expected through the weekend. down south millions are under a freeze watch. >>> we are getting a first look at the restored notre dame cathedral, five years after the inferno french president and emmanuel macron toward the restored cathedral, which will soon open to the public. for now, back to dateline. dat. detectives were preparing to arrest jose rodr