The family of "the woman with the flower tattoo" has been told her murder may be linked to a serial killer known as The Scalp Hunter and The Canal Murderer.
John Sweeney dismembered two former girlfriends before dumping their bodies in canals in Rotterdam and London.
He was known to be living in Belgium and Holland at the same time as the body of Rita Roberts was found washed up at a water treatment plant in Antwerp.
Police say she met with an extremely violent death - similar to Sweeney’s two victims who were about the same age as Cardiff-born Rita.