The Mumbai Police has traced the person who had sent a resignation letter to the employer of Sheena Bora on her behalf, at the behest of her mother Indrani Mukherjea, weeks after she was brutally killed and her body disposed off, Police Commissioner Rakesh Maria said here late on Thursday.

The same person also sent a mail to her landlord foregoing her lease and licence agreement on a rented flat, he said.

In a brief interaction with the media, Maria said that while investigating, the police found a letter of resignation to her employer and another letter to the landlord were sent on Sheena's behalf after her death.

"We have traced and recorded the statement of a person who had sent the emails to her employer and landlord (cancelling the lease and licence rights of her rented flat). The person concerned has signed on behalf of Sheena Bora, at the behest of the lady accused (Indrani Mukherjea)," he said.

"The resignation letter was sent to her employer company on May 7, 2012, while the letter to her landlord sometime in July, 2012," Maria said.

Sheena was allegedly strangulated by Indrani with the help of her ex-husband Sanjeev Khanna and her driver Shyam Rai, on April 24, 2012.

Sheena was employed as an assistant manager with Mumbai Metro One Pvt Ltd since 20 June, 2011. She had taken leave of absence from her work, on April 24, 2012, the day she was killed, as she wanted to meet her mother.

Maria added that the probe in the sensational murder case progressed at a "brisk pace" on Thursday, but declined to reveal other details.