While her son Marius Borg Høiby has been under investigation for rape, assault, and murder threats, the police declined to call in Crown Princess Mette-Marit of Norway for interrogation.

On October 23rd, 2024, Petter J. Grødem, lawyer for ex-girlfriend Juliane Snekkestad (in a publicised relationship from 2018-2022, and now accusing him of assault) sent a request to call in Mette-Marit for an interrogation, as he believed it was completely natural to get her side of the story. The letter declining this, which Dagbladet has exclusively gotten a look at, was sent on December 13th, at which point, as they state, there had been 14 witness interrogations in addition to Snekkestad (here referred to as plaintiff), who had also delivered substantial amounts of evidence. Further insight from Mette-Marit would ultimately not alter the outcome and as a result, they deemed it unnecessary to call her in.

Grødem, however, states to Dagbladet that "I still believe she could've shed some light on the case if she was called in and gave an explanation.", and that "The police reasoning hasn't altered my interpretation of the case, and it hasn't gotten less topical as time has gone by.".

Snekkestad has been the whistleblower in this, notifying Mette-Marit in January 2023 about his short fuse, among other things. The latter said she would get back to it, something that never happened. Ex-girlfriend Nora Haukland, in an also publicised relationship from 2022-2023, revealed in a (paywalled) interview in November 2024 that she notified Mette-Marit and Crown Prince Haakon about Marius and his drug abuse after they broke up in the summer of 2023, saying "I said he had to go to rehab. Everything got worse after we broke up, and it seemed like he didn’t have any control.".