A man who posed as doctor and prescribed a watermelon, among other remedies, to a Belmont woman struck a plea deal with prosecutors in San Mateo County Superior Court on Friday.

Yevgeniy Valentine Vasin, 54, pleaded no contest to two misdemeanor charges -- practicing medicine without a license and advertising oneself as physician without a license -- in exchange for 30 days in jail with credit for two days served, District Attorney Steve Wagstaffe said. Prosecutors say between 2009 and 2010, Vasin claimed he was a doctor and provided medical treatment to Belmont resident Ronelle Kotter and her daughter Marika.

Kotter, who passed away in December 2010, had been diagnosed with Multiple sclerosis at University of California at San Francisco. But, according to prosecutors, Vasin told Kotter she had Lyme disease. Vasin instructed Kotter to cut her dosage in half of the pills prescribed by doctors at UCSF, and injected her with Cerebrolysin, Proserin and Vitamin B-12, according to prosecutors.

Vasin also treated Kotter's daughter Marika, who had been diagnosed at Stanford Hospital with Dermatomyositis. Vasin reportedly told Marika her diagnosis was wrong and that she really had Lupis. He used vitamins to treat Marika, and told her she needed to eat a watermelon in a hot tub in order to help her kidneys.

Kotter's children called the police, who investigated Vasin and found that he wasn't a licensed physician after all.

Police also discovered Vasin had failed half of the California Medical Exams, and had only been trained briefly in his native Ukraine.

Vasin was arrested on Aug. 9, 2010, and posted bail almost immediately. Vasin had originally been charged with a felony count of practicing medicine without a license.