West Bengal Chief Minister Mamata Banerjee on Sunday condoled the death of Keshari Nath Tripathi, a former governor of the state, describing him as "a man of great substance". A scholar, Tripathi had many books to his credit, Banerjee said. "The memory of his tenure in our state will remain indelible in the hearts of the people of the state. He had a very sincere and cordial relationship with me," she said in a statement.