Detectives investigating the vicious murder of Prabha Kumar have travelled to India to interview her husband and relatives in the latest development in the unsolved homicide case.
Ms Kumar, a mother of one who worked for IT firm MindTree, was walking home from Parramatta train station on March 7, 2015 when she was attacked and stabbed in a park.
The 41-year-old was on the phone to her husband Arun, who lives in India, when her throat was slashed.
She died on the footpath in Parramatta Park only a few hundred metres from her Westmead home.
For the past almost two years, NSW homicide squad detectives have been investigating Ms Kumar's murder, after initially ruling out robbery and sexual assault as a motive.
Police revealed last year they were investigating whether someone in India helped organise the killing.
Fairfax Media understands detectives have travelled to India in the past week as part of the investigation.
It is understood they will interview Ms Kumar's husband and her family members, many of whom were spoken to when they visited Sydney in 2015 for a memorial service.
Months before her death Mrs Kumar travelled back to her hometown of Bengaluru in India to see Mr Kumar.
After hearing his wife's screams, Mr Kumar jumped on a plane bound for Australia almost immediately.
Mr Kumar said he only learnt of his wife's death when he arrived in Sydney.
He was making plans with his wife to join her in Sydney with their young daughter.
Fairfax Media has contacted Mr Kumar for comment.