The suicide note read, "I am committing suicide after killing my daughter. I am under depression due to my illness. No one is responsible for our death."
Police said the "suicide note" had been written to mislead the investigators as the throats of the victims' - Geetanjali and her two-and-a-half-year-old daughter Ananya - were slit.
When Geetanjali's husband returned home, he found the door bolted from inside and called the police as he couldn't reach his wife after repeated attempts.
A case of murder has been registered at Mandawali police station. Police is questioning Geetanjali's husband, their neighbours and landlord to ascertain the motive behind the alleged murders.