Carromero, who is affiliated with a youth wing of Spain's ruling conservative party. He and Aron Modig of Sweden, also a political activist in his home country, came to Cuba to support the island's dissidents, who are branded traitors and mercenaries by the Cuban government.
They were driving to eastern Cuba with Paya and Cepero in the back seat when the crash happened. The Europeans, who were in the front and wearing seatbelts, were not seriously injured.
Modig returned to Sweden a little over a week after the accident.
Paya, 60, was famous for leading the Varela Project, a petition that gathered thousands of signatures calling for a referendum on rights such as freedom of speech and assembly.
The European Union awarded Paya its Sakharov human rights prize in 2002 in recognition of the project.
Associated Press writers Andrea Rodriguez in Havana and Bradley Klapper in Washington contributed to this report.
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