Yes, Eric Dolphy tragically died on June 28, 1964, in a Berlin hospital because negligent workers failed to treat his diabetic condition.
By the time of Dolphy's death, Mingus and the rest of the band had already bid Eric "so long," and had returned to the United States.
The Stuttgart date (some say it was at Liederhalle, some say Mozartsaal...probably the same place) was Eric Dolphy's last show with Mingus. Dolphy was planning to unite with his fiance in Paris and to live somewhere in Europe. He recorded some with European free jazz musicians after the Mingus tour, and was to record next with Albert Ayler.
I've upped five from the tour, the sole video that I know to exist, and am tapped-out at the moment.
That last one is from a trade with Mr. BigO.
Charles Mingus 6 Town Hall, NYC, Apr. 4, 1964
Charles Mingus 6 Concertgebouw, Amsterdam, Holland, Apr. 10, 1964
Charles Mingus 6 University Aula, Oslo, Norway, Apr. 12, 1964
Charles Mingus 6 Konserthuset, Stockholm, Sweden, Apr. 13, 1964
Charles Mingus 6 Stockholm, Sweden, Apr. 13, 1964
Charles Mingus 6 Old Fellow Palaet's Store Sal, Copenhagen, Denmark, Apr. 14, 1964
Charles Mingus 6 Bremen, West Germany, Apr. 16, 1964
Charles s Mingu6 Salle Wagram, Paris, France, Apr. 17, 1964
Charles Mingus 5 Theatre Des Champs-Elysees, Paris, France, Apr. 18, 1964
Charles Mingus 5 Palais De Congres, Liege, Belgium, Apr. 19, 1964
Charles Mingus 5 Bologna, Italy, Apr. 24, 1964
Charles Mingus 5 Town Hall, Wuppertal, West Germany, Apr. 26, 1964
Charles Mingus 5 Mozartsaal, Stuttgart, West Germany, Apr. 28, 1964