Did embarrassment of losing a home to foreclosure lead to murder?

For years, relatives and friends of 25-year-old Heidi Firkus have been puzzled by her death in 2010 at the home she shared with her husband, Nick, in Saint Paul, Minnesota.

Heidi died from a single shotgun blast to her back that her husband said she suffered as he wrestled with an intruder. Nick Firkus told police a man burst through their front door in the dawn hours of April 25. Moments earlier, at his request, Heidi had called 911 to report an intruder was breaking into their home. 

Heidi's murder was unsolved until investigator Nichole Sipes of the Saint Paul Police Department was assigned the case.