Yes, it mentions his death in the beginning of chapter 7.
Papa Eftim I died in 1968.
Papa Isio died in 1911.
Katina Papa died in 1959.
Vincent Papa died in 1977.
Papa French died in 1977.
Marco Papa died in 1999.
In the Time of the Butterflies was created in 1994.
Papa Kristo Negovani died in 1905.
Papa Lightfoot died on 1971-11-28.
Papa Celestin died on 1954-12-15.
Papa Eftim III died in 2002.
Papa Bue died on 2011-11-02.