When a villager in the southern province of Guangdong was walking near his home on a mild day shortly after Christmas in 2019, he noticed a yellow suitcase beneath an expressway embankment. Inside was the headless body of a woman. When police arrived and searched the area, they found the head inside a red travel bag alongside the highway, about 1km south of the villager’s discovery. Nearly seven years later, details of the forensic investigation have been revealed in a peer-reviewed paper that...