A post-mortem has found that Australian teacher Gabrielle Maina, who was shot in Kenya, died from a single bullet wound to the neck.

Authorities involved in the examination added that they found a single bullet exit wound on her back.

Ms Maina, who was formerly from Armidale in northern New South Wales, was killed last Thursday as she walked along a road near her home in Nairobi.

Kenyan police are still trying to determine who killed Ms Maina and why – thus far no suspects have been arrested.

It is unclear whether the attack was a robbery gone wrong or a targeted killing.

Her lawyer George Kingori said there were signs the teacher feared for her life and was forced to kneel on the road before she was shot.

It has also been revealed that Ms Maina was granted a restraining order against her former husband before her death.

The ABC approached Ms Maina’s husband via his lawyer, but he has not responded.

Staff from a nearby lodge and function centre heard the gunshots and rushed to the scene.

“I head the sound of a gun, two times,” local gardener Kevin Mayodi said.

“After a few minutes, I come to see what’s going on. I find somebody lying down, who was shot.

“I found the lady down. She was injured here on the neck. Already was dead.”

Many things and people make us love Australia. For Hillcrest Preparatory School it is our Head Teacher Ms. Gabrielle Happy #AustraliaDay pic.twitter.com/3sXDcnqUsC

— Hillcrest Schools (@HillcrestKE) January 26, 2017

Students from the school where Ms Maina worked in Nairobi are returning to class after term holidays.

The school is yet to announce whether it will hold a remembrance service.

Friend and former teacher Emmanuel Simiyu Munyole said Ms Maina was generous and loyal.

“Words cannot describe Gabrielle. To me, I think she is from a different planet, or different world. She was so kind hearted,” he said.

He wants those responsible for her death brought to justice, calling them selfish and cowards.

-ABC