Varsha Rani, the wife of Sameer Kumar, also said she would observe a day-long fast on January 18 in front of the District Magistrate's office on the issue.
Kumar was the mayor of Muzaffarpur Municipal Corporation from 2002 to 2007.
Varsha Rani alleged that the course of investigation has changed entirely under the police.
She said that the murder of her husband has nothing to do with any land dispute as claimed by the police.
The Muzaffarpur police on December 24, 2018 had claimed to have cracked the ex-mayor's murder case saying that it was a fallout of land deal business gone wrong. A person who allegedly shot Kumar was also arrested from Patna airport.
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