Million dollar reward to find mum's killer ten years after her death

The 41-year-old IT worker was fatally stabbed by an unknown person while walking along Jubilee Lane in Parramatta Park at 9.30pm on March 7, 2015.

Her husband, who lived in India, was on the phone to Ms Kumar as she walked home from work and "heard her scream for help", police said at the time of the attack.

Ms Kumar's husband said after the attack: "I know that we can't bring her back, but I want whoever killed my gorgeous wife to be brought to justice".

Police said "multiple lines of inquiries" were pursued in the years after Ms Kumar's murder but the case remained unsolved.

The $1 million reward is on offer for information relating to the murder, investigators under Strike Force Marcoala said.

"Prabha was a wife and mother who spent her time caring for her family and contributing to her community and in 2014 she was murdered in cold blood," detective superintendent Danny Doherty said.

"Detectives have spent the last decade searching for Prabha's killer and we are hoping this reward will shake loose the memories of those who saw Prabha before her death who might be able to help police," he said.

"This reward is about bringing justice for Prabha's family and community and it's about finding answers and putting her killer before the courts so they can answer for this crime."

Anyone with information that may assist investigators is urged to contact Crime Stoppers: 1800 333 000 or https://nsw.crimestoppers.com.au. Information is treated in strict confidence.