What is the ruling if one witness testifies to a confession of intentional killing and another testifies to a confession of accidental killing?

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The killing is established because there is no contradiction between their testimonies; it is possible for the accused to have confessed to intentional killing to one and accidental killing to the other. Thus, the killing itself is established through their combined testimony, but its specific nature is not. The accused is then required to specify the nature of the act, following the prior ruling regarding the unproven attribute.