Metropolitan Magistrate Shivani Chauhan said the woman was deserted by her first husband and it was not clear whether she obtained divorce from him and without legal separation she could not have got married with the accused.
The court said evidence does not show that the accused and the woman had contracted a valid marriage.
The woman's parents had filed a complaint against Delhi resident Rajbir alleging that he used to harass and cruelly treat their daughter to meet his demand for dowry.
"For the application of section 498A IPC, it is necessary that the cruelty complained of must be inflicted by the 'husband' or the 'relative of husband'. Thus, the subsistence of a valid marriage is a sine qua non to bring home the offence under Section 498A IPC.
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"In the instant case, the marriage between the victim and the accused itself is doubtful, the accused cannot be said to be the husband of the victim," the court said.
A complaint was lodged at Sri Niwas Puri Police Station by the victim's father against Rajbir for allegedly cruelly treating the woman to get his demand for dowry fulfilled.
The woman had died in June 1997 after suffering 90 per cent burns in her house.