Story highlights Wesolowski is the highest-ranking former Vatican official arrested on sexual abuse allegations

His trial had to be delayed last month when he fell ill

(CNN) Jozef Wesolowski, a papal ambassador and the highest-ranking Catholic official to be put on trial for child abuse charges, died in his room early Friday.

"Vatican authorities quickly carried out the first investigation and have established that the death was caused by natural causes," a Vatican statement said. An autopsy has been ordered and Pope Francis informed.

Wesolowski was accused of possession of child pornography and sexually abusing children during his time as papal nuncio to the Dominican Republic

His trial had to be delayed last month when he fell ill and was rushed to a hospital in Rome.

Wesolowski, 66, was the highest-ranking Catholic official arrested for alleged sexual abuse of minors.

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