I do not know why people like A 1981, who have not an iota of criminal law knowledge come here and give useless advice like mad dogs, spitting poison about women. Does it show that he is a hero to protect men's rights? Criminal law is a serious thing and one who does not have knowledge should not give advice in this field. Any how, coming to legal points:
1. As the marriage was held in 2008, and her suicide was within 7 years of marriage, the offence under Section 304-B is maintainable.
2. That goes in your favour is - If SDM has not taken her dying declaration- but as per your first post 'magistrate' -I suppose SDM- has taken the dying declaration. If that is so, the contents of dying declaration will occupy greater significance in your case. Has she said that you demanded dowry? If not, you are quite safe.
3. Obtain dying declaration and go through it.
4. If you have not demanded for dowry in the proximate time of her death, say within 3 to 6 months of alleged incident, then, the case cannot lie under Section 304-B. So, the case hinges upon the sole fact that whether you demanded the dowry in the near about time of her death. If you have demanded dowry at any point of time, not near point of time of death, and it resulted to her death, then you will be convicted under Section 498-A instead of Section 304-B, the former is lesser offence. Nexus to the demand of dowry and the death has to be established by prosecution to prove the case under Section 304-B.
5. If dying declaration does not talk about dowry and narrates the story, which you told herein, your refusal to allow her to go to her natal home, then you are quite safe.
6. Absence of dowry demand reference in dying declaration, but mentioning of the same in the complaint lodged by her parents and section 161 Cr.P.C. statements, will not put you in disadvantage position.
7. Anticipatory bail is difficult to get in the given circumstances, but regular bail will depend upon the dying declaration. If FIR is registered under Sectin 304-B and Section 498-A, it is difficult to prescisely say, how long you will be put in jail, that depends upon the strength of the documents and discretionary power of the court. In most of the cases, maximum that before filing of the charge sheet or in some cases, immediately after filing of the charge sheet (maximum 90 days), one gets bail