Exclusive: Police Consultant Analyzes Officer's Murder

"Not every dangerous-edged weapon is a knife, not every dangerous-edged weapon is a sword, so you've got to think beyond what you've seen before, and remove all objects from prisoners," said Jensen.

The retired captain from Portland is talking about the necklace you see hanging around Lawrence Wallace Junior's neck as Officer Green leads him to his cruiser. Wallace appears to fold the pendant and slide something out of it; turning if from a diamond into a triangle. Twenty minutes after that, Officer Green was dead.

So was the necklace a weapon? Or a way for the suspect to free his hands from the handcuffs? Surveillance video inside the sally port may someday have the answer.

"A sally port is like a box, and two ends open," said Jensen. "So the exit is closed, the entrance opens up, you pull the car into the sally port, now the police car is in jail too. The police car can't leave but the bad guy can't leave either."

Wallace is accused of stabbing Officer Green inside the sally port of Metro Jail. Then he took off for Dauphin Island Parkway in the officer's car.

Another officer was wounded by gunfire before the three-and-a-half hour standoff finally came to an end - with the suspect in a body bag. But Captain Jensen says we're lucky more people weren't hurt.