Detective issues urgent plea after canal killer who dismembered girlfriends dies

Double murderer John Sweeney killed former girlfriends Paula Fields and Melissa Halstead (Picture: Metropolitan Police / SWNS)

A detective who caught a serial killer who dismembered his victims is hoping someone will come forward and reveal the location of their heads.

Double murderer John Sweeney died in prison at the age of 69, having never revealed the whereabouts of some of the body parts of Paula Fields, 31, and Melissa Halstead, 33.

Howard Groves, the retired Metropolitan Police officer who led the investigation into Sweeney, hopes people ...