Police are probing the death of a 33 year-old man last month at a Tokyo bar, suspecting he may have been drugged, investigative sources said Thursday. Police are questioning Fumihiko Kawamura, 37, and Yumiko Takada, 34, who jointly run the bar, suspecting they were involved. The Iruma, Saitama Prefecture, man, who was not named, collapsed Dec. 22 shortly after he arrived at the restaurant in Tokyo's Kabukicho district accompanied by a woman working there. He later died in a hospital. He was very drunk when he arrived at the restaurant, according to the sources. An autopsy revealed he had an extremely high blood-alcohol content, but the cause of death remains unknown. Police suspect he was drugged. The next day, 1.25 million yen was withdrawn from his bank account, the sources said. Kawamura and Takada had been arrested in a separate case in which they allegedly got a 35-year-old customer drunk, beat him and took 100,000 yen in cash on Dec. 4.