lorenzo simon , 34 , of smethwick , west midlands , and his girlfriend michelle bird used their friend michael spalding for slave labour before simon killed him and dismembered his body .
the 39-year-old 's remains were stuffed into two suitcases before stuffing the body in a suitcase and throwing it into a canal .
police have now released cctv video footage showing the pair dragging the cases along a pavement .