While Tostee could technically face fresh charges over Wright's death, legal experts say there would have to be new and compelling evidence uncovered by McDougall.
A Justice Department spokeswoman told the Sunday Mail that investigations were ongoing.
Tostee, who has now changed his name to Eric Thomas, again made headlines last week when he lashed out at 'screeching fembots' he claims are obsessed with "victim blaming".
He said the phrase "victim blaming" was "hardcoded into the fembot brain".
"They shout it out voluntarily whenever they detect the slightest suggestion that a female might be responsible for her own actions," Thomas posted on the 60 Minutes Facebook page.
"This signals a challenge to all the other fembots, who then start shouting it louder and louder themselves. Whoever screeches the words loudest becomes the alpha fembot.
"Then, they go back to reading their true crime paperbacks and crying themselves to sleep."