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Mode of death is seen from the 3rd Bhāva from the Ārūḍha Lagna. Here we have the headless Ketu showing the breaking of the wind-pipe (symbolic of the cutting off of the head associated with the nodes) and the fact that Śukra is the Lagneśa of the chart shows that this is by his own hand. The fact that this happens in the Bādhaka Sthāna confirms the diabolical nature of the event.
Having said that the Karma behind it appears to be clear as day.