there are said to be two types of marana, that is death in Buddhism- the kaala marana that is the timely death - the death which is by the exhaustion of particular kammas and in the old age.the other is the akaala marana, that is the untimely death. the vipaka of some kammas are so great that the rupa ceases to exist and the nama continues in the next form. such death is the one in young age in some kind of accident or so on.
suicide could be considered into the kind of untimely death where the kammas are not yet exhausted and you yourself is curtailing the rupa. it is believed that the balance life with the kammas and the kammavipaka of the act of commiting suicide combines and gives one the next birth where one has to live the balance life of the earlier one and also the current one.
that is the reason the suicide is not talked about or favoured by in buddhism. this is what i have read.
may be you can say something more on it.

in metta
Dr. Yojana Bhagat


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