Kumar, who initially took a defiant stand on the charges levelled by his wife Yamini Thankachi as "totally baseless" and also ruled out his resignation till last evening, later drove to the Chief Minister's residence and submitted his resignation.
The Kerala Congress (B) leader, who resigned after his wife lodged a police complaint alleging domestic violence, stated in his resignation letter that he was quitting "owing to personal reasons."
The exit of the 46-year-old actor-turned-politician became imminent after Chandy advised him to put in his papers.
Seizing the issue, the CPI(M)-led Left Democratic Front in the state Assembly demanded the Chief Minister's resignation accusing him of misleading the House that he had not received any complaint from Kumar's wife.
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As soon as the Assembly began its proceedings, the LDF members were on their feet alleging Chandy had lost moral right to remain in office and demanded an immediate discussion over the issue.
The long-running incompatibility between the couple reached a flashpoint yesterday with Kumar filing a divorce petition in a court here.
While Kumar charged his wife of "blackmailing" and "manhandling", Yamini rejected the allegations and asserted she was a victim of "domestic violence" for the last 16 years after she objected to her husband's "illicit affairs".
Yamini also alleged that she could not get justice from the Chief Minister whom she had approached with a complaint.