The couple, both aged 19 and hailed from Bhabua in Bihar, consumed some poisonous tablets, Kolsewadi police station's senior inspector Kalyanji Gete said.
A police patrolling team yesterday spotted the couple lying unconscious in Netivali hills area and rushed them to hospital, he said.
The victim, Chandini Singh, was declared brought dead by doctors last night, while the man, identified as Pradeep Sharma, is being treated at Rukminibai hospital, he said.
The body has been sent for postmortem.
A case of accidental death has been registered, police said adding that further probe was on.