Abstract In 1953 a human skeleton and a set of tools made from antler, bone, bronze, stone and wood was found embedded in marine clay under a former inlet of Lake Mälaren at Granhammar in Västra Ryd parish, Uppland province, Sweden. Andreas Oldeberg and Nils-Gustaf Gejvall published the find in 1959, and for half a century it did not see continued study. This paper reports on a comprehensive series of re-studies and laboratory analyses of the skeleton and the artefact finds. Among the results are an unambiguous date by multiple methods in the late 800s cal BC, i. e. late Period V in Montelius’ chronology. Inferences are made about the individual’s geographical origin, diet and main occupation. Comparisons are made with the victims of mass violence from Tollense Valley in Mecklenburg-Vorpommern. In a time and place where almost every dead person was cremated and no human remains were buried under anything but the strictest ritualised circumstances, Granhammar Man offers something unique and valuable. He was killed in combat far from home and sank to the sea floor with his leather-working equipment.