John Sweeney, a convicted British serial killer known as the "canal killer," has died in prison at the age of 69 without disclosing the whereabouts of his victims’ severed heads. Sweeney was serving a whole-life sentence after his 2011 conviction for the murders of his two ex-girlfriends, Paula Fields and Melissa Halstead. Both women were murdered, dismembered, and their bodies disposed of in canals located in London and the Netherlands. While the remains of both victims were eventually recovered—though a decade apart—the heads and hands of Fields and Halstead have never been found.

Sweeney was not initially connected to these killings. He came under suspicion only after a violent axe attack on another girlfriend, who survived thanks to the intervention of a neighbor. Further investigations subsequently tied him to the earlier murders.

The 69-year-old carpenter died of cancer on August 14 at HMP Whitemoor, a high-security prison in Cambridgeshire. A spokesperson for the Prison Service described the crimes as "horrific" and extended sympathies to the victims’ families.

Authorities have noted that Sweeney exhibited violent tendencies beyond the known murders. Paintings and poems found at his residence reportedly contained disturbing references to violence. Police have indicated that they suspect he may have been responsible for additional undisclosed crimes, though no further convictions were secured.

The inability to recover the victims’ heads and hands has left unanswered questions regarding the full extent of Sweeney’s crimes and the reasons for his failure to reveal the locations before his death. Investigators continue to examine the case for potential leads but have yet to uncover new information stemming from his passing.