A 37-year-old man suspected of killing a female member of an acting troupe in Tokyo last August has confessed to murdering her, investigative sources have said.

Takahiro Tokura initially denied involvement in the death of 25-year-old Risa Kagaya after he was arrested Saturday, but reversed his statement Sunday evening, saying, "I killed her and will take responsibility," the sources said Monday.

Police believe the two were unacquainted as Tokura's contact information was not registered on Kagaya's smartphone and as they found no personal connection between the two after visiting her workplace and questioning the troupe and friends.