A 34-year-old American man was found stabbed in Tokyo's Roppongi district Thursday night and later died, police said early Friday.
Police identified the victim as Matthew Littauer, a Vietnamese-American who operated a consulting firm.
Littauer died of multiple stab wounds after being found at around 11:10 p.m. on the third floor of a building in Minato Ward, where his office is located, police said.
He usually worked on business for customers in Australia in the morning and came back to work after 10 p.m. for business with U.S. and European clients.