However, BJP today "questioned" his motive and asked for a probe into the matter.
"Instead of justice from the Gujarat government and the state police, we (he and his wife) got harassment in return that drove my spouse to commit suicide at the chief minister's (Modi's) office in Gandhinagar, no less. What is happening in Gujarat, should not repeat in other states," Kalpesh Patel told reporters today.
He said that in the next couple of weeks he will start a campaign in Varanasi by collecting many other "victims" of the Modi-ruled regime in the western state.
Narrating his tale, Patel, who hails from Mehsana district of Gujarat, says that he and his wife were being harassed by his in-laws. When they approached police, instead of lodging an FIR, he was detained in a lock-up and tortured by them.
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"I and my wife Ami Patel were harassed by my in-laws and instead of lodging an FIR against her accused family members, they (Gujarat police) wrongfully detained me in a lock-up and tortured me," he said in press conference.
"But in return, the police only harassed me after he dragged the matter in court," he said.
Patel claimed that unable to bear the agony any further, his wife committed suicide at the chief minister's office in Gandhinagar by consuming poison.
She died on April 28, 2012.
State BJP, however, has rejected all allegations and questioned the motive behind the move by an "unknown person".
"BJP rejects all such allegations as falsehood and I think the motive of this whole move must be questioned.
"The whole thing should be probed," BJP media in-charge for 'Kashi Prant' unit Sanjay Bharadwaj told PTI.
Patel also claims to have even documented his entire legal struggle, including court cases details, the personal lives of the couple, in a book form, which he claimed, "no one wanted to publish". "So, I opened a publishing house in my late wife's name and did it myself.
"I have also sent copies of the compilation to various heads of State in the US, the UK, Canada, Australia, Prime Minister Manmohan Singh, President Pranab Mukherjee, UPA chairperson Sonia Gandhi, and Anna Hazare, among others," he said.