Detectives have re-opened the investigation into the death of a baby in the state's north west ten years ago in the hope of solving the murder.

Five-month-old Mundine Orcher died from multiple injuries at Brewarrina in November 2003.

He died while in the care of relatives at a time when his mother was unable to look after him.

Detective Inspector Jason Darcy from the Unsolved Homicide Team says no-one was arrested at the time due to a lack of evidence.

"He sustained some terrible injuries all over his body which resulted in his death," he said.

"There were a number of suspects at the time but unfortunately no person was found responsible."

The Unsolved Homicide Team are visiting the town, re-interviewing witnesses and seeking more information.

Detective Inspector Darcy says he hopes new information will come to light that will lead to an arrest.

"We'll there was insufficient evidence at the time to prosecute anyone," he said.

"We're just revisiting that information and with the new information we have we'll hopefully get it over the line and hopefully get closure for the family for this case."

A police investigation and a coronial inquest have failed to uncover what caused the baby's death.

A post-mortem examination found he had suffered several broken bones in his short life.