The incident is being treated by investigators as a tragic accident, the Miami Herald reported.
They said 58-year-old Aristides, a 25 year veteran of the force and married for 38, had returned from his midnight shift as always on Friday night and gone straight to sleep.
His police Ford Explorer SUV was parked in the driveway, and was left unlocked, according to sources.
While her husband slept inside, Clara reportedly got into the back of the car around 1PM, but the door closed behind her and the self-locking mechanism — designed to secure prisoners and suspects — engaged.
"It's literally a cage," one officer told the publication.