A former dealmaker at Lazard Ltd., one of Wall Street’s most prominent investment banks, is accused by US authorities of feeding tips on health-care deals to a friend’s network of insider traders, who generated $41 million of illicit profits. Justin Kim — now facing both criminal and regulatory charges — received a Rolex watch and career advice while leaking 10 potential takeovers over several years through 2023, according to a complaint from the US Securities and Exchange Commission, seeking to ban him from the industry. Last month, the Department of Justice unveiled fraud and insider trading charges against Kim that carry up to 25 years in prison.