An important question remained: why did Partridge had to die, and why then?
1) Is he really meant to return of the dead? No, but maybe he helped to make that possible for somebody else. I assumed he was a member of Tyger Tyger, that he was the one who covered up their killings. However this could be motive for RJ to kill him, it doesn't explain anything important and also the timing seems random.
2) So we need a better explanation. Now, after I read a very interesting theory on this site about RJ's list-trick, it makes more logic to me that Partrigde worked for Red John, and helped to fake Lorelei's death after she was knocked unconsious. Her body is under the blood but her pretty face has not been touched what so ever. Though on the DVD her right cheek is firmly bruised. That's part one of RJ's trick, the second part was wiretapping Lisbon to find out the 7 names.
3) As someone also posted here, the pidgeons in that dark building are the important clue in S06E01: they referred to Lisbon's happy memory about her mother feeding pigeons. When Jane and Lisbon are talking in the park and there's a random lady feeding pigeons, Jane suddenly remembers. RJ must have added the pigeons for Lisbon (and not that poor Partridge). So now he knows how RJ did his cheap trick.
Partridge obviously had to die because he's the only one apart from RJ that knows Lorelei is still alive. RJ couldn't take the risk to have him talking, since he's also on Jane's list and would be watched closely The gps-trackers on the suspect's phones allow him to hit two birds with one stone.
As Lisbon once said, Haffner is a well known wiretapper - it doesn't exclude other suspects but Haffner allready became my only possible suspect after Partridge died: after we find out it's him and will review his episodes, many small details about his behavior will suddenly make a lot of sense.
This theory (all credits to the members here who found about it before) is for know the only one that gives a decent explanation for how RJ tricked Jane, so I tend to stick with it - untill someone finds even better :)
