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This was one of the last times 32-year-old Alex Pennig was seen alive. Video shows her and her friend,
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44year-old Matthew Ecker, arriving at Penn's apartment after leaving a bar in St. Paul, Minnesota. Matthew and Alex
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walked out of view as they went up to her apartment. But a short while later, they walked back through the lobby and
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out the door. Matthew said it was to get his headphones from his car. Alex returned to the lobby and waited
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for Matthew. For the detectives, what happened next was key. >> She seems impatient, just looking at her
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body language. >> They noted how when Matthew returned, Alex didn't hold the door for him and
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how he shrugged his shoulders as he followed behind her. Detectives wondered if Matthew and Alex had gotten into a
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fight. >> Something was going on with him. That's huge because that's the last time we see
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Alex alive. [Music] >> 20 minutes later at 2:50 a.m. Matthew called 911. >> A girl who shot herself.
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>> Matthew claimed Alex had shot herself, but detectives wondered if a conflict between them had led to murder. The
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lobby security footage had no audio, so there was no way to know for sure if the
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two had gotten into a fight. But Alex's family and friends shared their thoughts.
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>> You could tell that she was mad. You could tell the way she ripped open that door. You could tell Alex stomping on
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stomping in. >> Whenever she was mad, she'd like stop and she I was visible in this video. So,
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they were definitely in a fight. >> But when detectives questioned Matthew, he denied any problems.
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>> We were laughing. We Everything was fine. >> You guys weren't arguing anything.
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There's a whole fight with you two. >> No. >> And Matthew's family believes there
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could be a different reason for the change in Alex's demeanor. In the footage, Alex is on her phone. They
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wonder if she was messaging her boyfriend Shane. They believe she was arguing with him earlier in the day and
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suspect she was still upset with him. I truly believe there's a lot of information, a lot of texting, and we
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think having gotten those interactions would have given us a lot more insight into her state of mind.
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>> But detectives couldn't get into Alex's phone because no one knew the passcode.
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And Shane said he had lost his phone the night before, so they couldn't search his either.
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>> It seemed that there was some kind of exchange happening. Was she talking to you at all?
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>> I didn't have a phone, so Facebook message or anything like that? >> Uh, no. >> Detectives weren't able to know for sure
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what was really happening in the lobby, but it gave them a crucial glimpse into Alex Penn's final moments. Police
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officers arrived on scene shortly after Matthew made that 911 call. Detectives then had to find out what happened
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between this and the moment the gun went off. [Music]