POLICE are reportedly investigating whether a former Devon woman dubbed the Black Widow after murdering her husband with a poisoned curry had an undiscovered victim.

Dena Thompson, from Cullompton, was jailed for life after hiding antidepressants in Julian Webb's dinner on his 31st birthday.

It has now been reported that Interpol has resumed a search for a Bulgarian man she dated in the 1980s. Thompson, now 49, was jailed in 2003 for murdering Mr Webb at their home in Yapton, West Sussex.

Three years earlier a jury found her not guilty of attempting to murder Richard Thompson, another husband, during a bondage session.

Following her murder conviction, police set out to trace Thompson's former partners to establish whether she had other victims.

But according to reports they have never found Stoyan Kostov, a man Thompson — then known by her maiden name Holmes — dated in the late 70s and early 80s while she was training as a gymnast in Svishtov, Bulgaria.

A search by British and local police turned up no clues as to Kostov's whereabouts. Detective Chief Inspector Martyn Underhill, of Sussex Police, who investigated the murder, was quoted by The Mail on Sunday as saying: "We cannot rule out the possibility that other partners have been injured."

Journalist Adrian Gatton, who is investigating the case for a book, has said: "Some sort of incident seems to have happened in Bulgaria but we don't know what it was."