A German backpacker who was found dead two decades ago was likely killed by someone driven by a sexual motive, a coroner has found.

Simone Strobel had been travelling with her boyfriend and two other companions in the NSW northern rivers region in 2005 before she went missing.

Six days later, her naked body was found hidden under palm fronds at a Lismore sports ground.

Despite an earlier inquest, the identification of several persons of interest and a million-dollar reward for information, much remains unknown about her death.

The findings of a second coronial inquest were delivered on Thursday.

While it could not name a specific killer or cause of death, it did offer possible insights into her murderer's motivations.

"It is likely Simone's killer had a sexual motive," Magistrate Ter

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