Partridge is still alive. They only want you to think he is dead.

Partridge is the one that tased Lisbon when in the abandoned house. There is a reason they didn't show his face when Agent Cho checked for the tattoo on his shoulder in the morgue.

Then they will twist it to show that Jane did a reading over him when they were both children while working for his father at the carnival. This will be when they shook hands.

It's how I would have wrote it. I guess we'll find out soon enough.