The incident took place late last night, they said.
According to police, a worker in the Jewellery shop in the main bazar Anil Kumar Sukhwal, 29, was found dead in his room on Monday morning. Police had registered offences under sections 452 and 302 of the IPC against unknown persons.
Thane Nagar police had called the woman to the police station and started interrogating her last evening.
However, during the questioning, the woman requested the police to let her visit the toilet and later consumed phenyle.