Timeline: How the Aarushi murder probe unfolded

Following is the sequence of events in the investigation into the killing of 15-year-old Aarushi Talwar and domestic help Hemraj that culminated in the arrest of her father Rajesh Talwar on Friday.

Following is the sequence of events in the investigation into the killing of 15-year-old Aarushi Talwar and domestic help Hemraj that culminated in the arrest of her father Rajesh Talwar on Friday.

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May 16

Aarushi Talwar, daughter of a dentist couple, found dead with her throat slit in the bedroom of her flat in Jal Vayu Vihar; domestic help Hemraj suspected.

May 17

*Hemraj's body found on terrace of Talwar's house.
*Noida sector 20 station house officer shifted for lapses in investigations.
*Autopsy report rules out sexual assault.

May 18

*Police say murders done with surgical precision; insider job suspected.
*Superintendent of Police (City) Mahesh Mishra shifted out.

May 19

*Talwar's former domestic help Vishnu Sharma named suspect.

May 21

*Delhi Police join murder probe; police say murder committed by "doctor or butcher".

May 22

*Family under suspicion; honour killing angle probed; police quiz Aarushi's close friend Anmol, who she spoke to 688 times in the 45 days before she was murdered.

May 23

*Aarushi's father Rajesh Talwar arrested for twin murders.