Death:

1. When Saturn, Rahu, and Ketu simultaneously transit in the stars and subs of the badhaka and maraka significators in the birth chart - during a particular year in question - the native is likely to suffer from serious illness.

2. When Saturn, Rahu, and Ketu simultaneously transit in the stars and subs of the badhaka and maraka significators of the spouse in the birth chart - during a particular year in question - the native's spouse is likely to suffer from serious illness.

3. The sub lord of the lagna rising is known to have a mysterious link with death. While judging death, it is invariably found that the sub lord of the lagna rising - whether it be for a horoscope cast for the birth time or for a prashna(within 249), it has an intimate relation with the time of death - for example - its period, sub period, or sub sub period  must be connected with the time of death.

Please also see KP: Significator & Sublord