Tracking the hours before a young Minnesota woman became a murder victim

On Dec. 15, 2022, Matthew Ecker was headed to work when he said he got a frantic call from his former co-worker and friend Alex Pennig. He said Pennig told him she got in a fight with her boyfriend Shane Anderson and was scared of what he might do. So, Ecker took his gun, which he owned legally, and drove to Pennig's St. Paul, Minnesota, apartment.

Ecker arrived around 2 p.m. He would later say his only reason for going to Pennig's was to protect her. 

Early the next morning, Pennig was shot dead in her apartment. Detectives used surveillance footage to piece together her final moments.