A man suspected of fatally shooting six child welfare workers at a shelter for mothers in Stade in northern Germany last month died by suicide in jail on Tuesday, officials said.

The suspect, who has been partially identified in German media as 45-year-old Fatih Khan G., was found dead by jail staff in his single cell early Tuesday, the Lower Saxony state justice ministry said in a statement.

The ministry said there are “currently no indications of third-party involvement” in the suspect’s death at the jail, and that both his relatives and the relatives of the shooting victims had been informed.

Four women and two men were killed in the shooting on June 29 at a shelter for mothers and their children in the northern town of Stade.

The mass shooting is among the worst such crimes in recent German history.

The suspected gunman had arrived at the centre on June 29 for an appointment to discuss future care arrangements for his three-month-old daughter.

The youth centre where a mass shooting that killed six took place in Stade, northern Germany, last month. Photo: AFP