Gameplay - Bad Moon Rising Part One

As for Ekhardt: his record as a Judge is exemplary and precisely what one would expect for a member of SJS: over 300 investigations against Judges, resulting in 40 successful prosecutions – 10 resulting in Titan sentences. He was a hardliner who even had a shot at interrogating Dredd.

Any one of the 600 Justice Department officers Ekhardt investigated or interrogated might have motive for wanting him dead; but here is one curious fact. Ekhardt took the Long Walk and here are no MAC records for his return, which indicates that he was most likely killed – or at least captured – in the Cursed Earth.

If another Judge who held a grudge against Ekhardt killed him in the Cursed Earth, then he is, technically, beyond Mega-City One jurisdiction and cannot be tried for the act.
Only if Ekhardt was killed within the city walls could charges be brought.

You can access the SJS records and go through every Judge who crossed paths with Ekhardt but that could take anything from 10-60 hours of continuous work.

It takes a few hours, the rest of the shift, to go through just the 40 names that resulted in prosecution and determine if any went on the Long Walk. It draws pretty much a blank. Two Judges who were interrogated by Ekhardt and subsequently took the Long Walk are known to have died before Ekhardt took his. Of those sent to Titan, 6 never returned to Earth and the remainder who came back to Mega-City One are under PSU 24-hour surveillance. Their records show they now live blameless lives and not one of them has ventured out of the city.