Mr Wesphael has been in custody since 1 November and is suspected of having murdered Ms Pirotton.
55-year-old Mr Wesphael, a co-founder of the Francophone green party Ecolo, and Ms Pirotton were staying in an hotel in the coastal city of Ostend when an argument turned into a short fight. Mr Wesphael says that he went to sleep, finding his wife dead in the bathroom when he awoke. Mr Wesphael has always maintained that his wife took her own life.
However both an autopsy carried out on Ms Pirotton's body and a toxicology report point to her having died a violent death.
The Judicial Authority's Spokeswoman Céline D'Havé told journalists that “This confirms what we have always said". However, the Judicial Authorities are remaining tight-lipped about the exact cause of death.
Both Mr Wesphael and Ms Pirotton were under the influence of alcohol when Ms Pirotton died.