(Newser) – A prominent banker found dead in his bathtub with his throat slashed ear-to-ear may have taken his own life, according to police sources. Shawn Miller, Citigroup's managing director of environmental services, was initially thought to have been the victim of foul play, but a knife was found under his body in his Manhattan apartment, sources tell the New York Daily News; they say that suggests he cut himself, then fell on top of the knife. The 42-year-old was found by a doorman Tuesday afternoon after his boyfriend called building management out of concerns for his safety, the New York Post reports.

Police suspect Miller killed himself after a drug- and alcohol-fueled bender with a stranger he met on the Internet, the sources say; he was seen on surveillance video arguing with the man and later told the doorman not to let him back into the building. He called 911 to report somebody outside the building stalking him, according to police sources, who say crystal meth was found in the apartment. Miller, who joined Citigroup in 2004 after working for the World Bank, "was highly regarded at Citi and across the financial services industry as a thought leader and tireless advocate for environmental and sustainable business practices," the bank said in a statement. (Read more Citigroup stories.)

