Tollund man clues to why he died

I think that the Tollund man was sacrificed because he was found with robes and a iron ring around his neck, normally when a person has died they would put iron rings around their neck for offering to the spring goddess, also the seeds found in his stomach was only found in spring and the robes on his neck and his swollened tongue was sure that he had been hanged, normally in his time people hanged other people for sacrifice.