Heir to the £4bn Tetra Pak packaging fortune Hans is due in court later today to face the charge.
The body of Eva was found at the couple’s mansion in Belgravia after Hans was arrested for driving erratically in south London.
A postmortem failed to establish the exact cause and time of Eva’s death, but it is understood that she had been dead for days before she was found.
Hans has been held by police since he was arrested on July 9.
The couple first met at a drug rehabilitation clinic and had donated millions to drug addiction charities.