I have a couple in mind : Singer Mia Zapata, State Trooper Roy Caffey, and retired banker Bill Henderson.

It may take awhile to say this conclusively... but John and Linda Sohus. :)

Also, I was amazed that a suspect was convicted in the Ethel Kidd, Lisa Marie Kimmell, and Dorothy Donovan cases.

Depending on whether you believe the FBI report, How about "Amerithrax"?

I thought that one would never be solved or would be covered up.

Dorothy Donovan and Lisa Marie Kimmel for the little-to-no evidence or explanation in both of those cases, and the ATV murders for the amount of time that had passed.

Never thought that Moxley case would be solved. Figured it would be another example of the rich getting away with murder.

The Randolph Dial one is another I didn't expect to see solved.

I was quite pleasantly surprised when Alex Kelly's 'ski trip' came to an end.

I have a couple in mind : Singer Mia Zapata, State Trooper Roy Caffey, and retired banker Bill Henderson.
Wait, Ray Caffey's case was solved? when and how?

Wait, Ray Caffey's case was solved? when and how?

Here is a memorial page that talks a little about the conclusion of the case:

http://www.odmp.org/officer/2652-patrolman-roy-odes-caffey