Shawn D. Miller, a Citigroup Inc. managing director who was global head of environmental and social risk management, was found dead in his New York apartment after suffering a neck wound, police said.

Miller, 42, was found unconscious two days ago in the bathtub of his Greenwich Street apartment in lower Manhattan with a neck laceration, the New York City Police Department said in a statement. Medics declared him dead after responding to an emergency call at 3:11 p.m. and investigators are waiting for the medical examiner to determine a cause of death, police said.

The New York Post reported that Miller’s throat was slashed and that no knife was recovered, leading authorities to suspect foul play. The Wall Street Journal, citing a law enforcement official, reported that police are seeking to talk with a man who was seen in the elevator with Miller before 6:30 p.m. on Nov. 15 and appeared to have a dispute with him.

Miller “was highly regarded at Citi and across the financial services industry as a thought leader and tireless advocate for environmental and sustainable business practices,” bank executives wrote in a memo to employees in his division. “He will be greatly missed by all who knew him.”

Doorman’s Discovery

Investigators didn’t find weapons or signs of forced entry, police said. The building’s doorman found Miller after his boyfriend said he was unable to reach him, police said.

Miller advised executives and clients on sustainability matters, including environmental and social policies related to industries such as mining and renewable energy, according to his LinkedIn profile. He helped oversee the development and implementation of policies in more than 100 countries.

In 1995, he joined the International Finance Corp., the private sector investment arm of the World Bank Group, where he helped evaluate finance risk in emerging markets, according to his LinkedIn profile.

Miller joined Citigroup in 2004 as part of the firm’s project to implement a set of finance industry-developed sustainability practices known as the Equator Principles, the profile shows. He was a recipient of a 2007 Financial Times Sustainable Banking Award.

He received a master’s degree in international relations from the Maxwell School of Citizenship & Public Affairs at Syracuse University and was a fellow in Bengali at the South Asia Center at the Maxwell School and the American Institute of Indian Studies in Calcutta, according to the LinkedIn page.