Professor Dhruba Kumar, an expert in international relations and security affairs, passed away on Wednesday. He was 73.

According to a family source, he died during the course of treatment at the Dhapasi-based Grande International Hopistal last night.

It has been learnt that that Kumar had been suffering from kidney related problems for the past many years.

He was a columnist for Kantipur daily for about  nine years.

Kumar is survived by his wife and three daughters.