“He is a tireless warrior for our movement,” said Bhairavi Desai of the New York Taxi Workers Alliance, which represents cabdrivers. “He has turned his grief into armor to protect fellow drivers.”

In a series of interviews this year, Richard said he believed that he owed it to Kenny to share their story to try to prevent more suicides.

But he also said he had begun feeling the weight of carrying the industry’s collective sorrow. He said he had decided to stop answering calls from reporters. He added that his publicity had created tension with friends and angered some of his siblings.

During one conversation, at a taxi stand in Chinatown, Richard said he sometimes wondered whether the death was his fault. He had encouraged his brother to join the taxi industry, to buy a medallion, to sign the loans.

He also wondered if he could have done more when Kenny started becoming sad. Should he have lent him money? Or forced him to go to therapy? Or reported him to the city?

“I didn’t have any experience with the depression,” he said. “I didn’t know what to do.”

Today, Richard is still struggling to pay his own loan. He owes $402,000, and he said it is hard to make the $2,766 monthly payments. He cannot support his daughter and his son, 19, who are both in school.

If officials do not bail out medallion owners, as they are considering, he plans to declare bankruptcy.