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King Richard III was most likely to have been killed by two blows to the head and one to his pelvis, according to new scientific research.
The English king was killed at the Battle of Bosworth on 22 August, 1485.
I thought it was a mistake to write 'have been' in this sentence.
It must be 'has been' here.
King Richard has ...
Kings have ...
They have been killed is correct.
He has been killed