On the afternoon of Saturday, December 20, 2014, police in Glendale, Arizona, responded to an apartment complex and found 55-year-old Michael Simpson dead from a gunshot wound. Investigators treated the shooting as an isolated incident and reassured the public there was no broader threat to the neighborhood.

Detectives canvassed the complex and interviewed neighbors while attempting to piece together what happened, but no motive was released and no suspect description was made public. The investigation later went cold and remains open, leaving the family without answers.

If anyone lived at that apartment complex or remembers unusual activity on December 20, 2014, please come forward with any details that might help the case.