[2][3] Together with his helpers he took great care to recover 760 artifacts from these Alemannic graves: skulls and bones, coins, pottery shards, combs, necklaces, belts, locks, swords, spears, arrows and spores, which he researched and published up to the end of his life.
On 4 November 1926 the Feuerbach Museum of Local History was inaugurated under Kallee’s directorate.
He died in Feuerbach on 15 July 1933, just three weeks after his wife, and was buried in an honorary grave in the cemetery there, which is still maintained by Stuttgart City Council.
The pastor of Cannstatt Jöhne praised his eloquence, his open, healthy character, which had however no lack of corners and edges, and especially his love for the homeland and its history.
The local historian and museum curator Prof. Peter Goessler said in his obituary: "Kallee was mentally agile, versatile, interested, and capable of quickly reporting about things that impressed him as a skilled orator and writer."