A 911 call cuts short with a gunshot. A husband claims an intruder murdered his wife, but was it a tragic accident, or a calculated cover-up to hide a failing marriage and impending foreclosure? Dive into the gripping mystery surrounding Heidi Firkus' death in this full episode of "48 Hours." Then, join the "Post Mortem" podcast for an in-depth discussion with investigators and producers as they explore the evidence and conflicting theories. Did Nick Firkus orchestrate his wife's murder? Watch now to unravel the truth!