Attorneys and staff at Murtha Cullina are mourning the recent deaths of two longtime partners, both of them well-known for their work in the financial end of the legal profession. One of them, Michael McDonough, was one of the firm’s current leaders, while another, Donald Richter, was an influential figure a half-century ago.

McDonough, 52, joined the firm in 1997, became partner in 2005, served as chairman of the business and finance practice group for many years and became a member of the firm’s executive committee in 2014.