Mum whose son, 4, was killed by his own father in a murder-suicide pays tribute ...

The mother of a little boy who was killed at the hands of his own father in a tragic murder-suicide has issued a gut-wrenching message dedicated to her son.

Natsuko Kurihara wrote that her 'beautiful son' Koah was killed by his dad Troy Harvey on Friday and begged her son to forgive her, saying 'I'm so sorry I couldn't save you'.

Paramedics and police called to the horrific scene worked for an hour to try and save the boy's life after officers were called to a property in the town of Rossville, north of Cairns, just before 10am on Friday morning. 

'My beautiful boy Koah, he has had only four years of life, this has been taken by his father. He then took his own life,' Ms Kurihara posted on Saturday.

Koah, 4, (pictured) was killed by his dad in a horrific murder suicide in Queensland on Friday

Koah, 4, (pictured) was killed by his dad in a horrific murder suicide in Queensland on Friday

Natsuko Kurihara (pictured, left) wrote that her 'beautiful son' Koah (centre) was killed by his father, and expressed her pain that she 'couldn't save him'

Natsuko Kurihara (pictured, left) wrote that her 'beautiful son' Koah (centre) was killed by his father, and expressed her pain that she 'couldn't save him'

Mum Natsuko Kurihara (pictured, left) said Koah's dad, Troy Harvey (right), had killed his own son

Mum Natsuko Kurihara (pictured, left) said Koah's dad, Troy Harvey (right), had killed his own son

'I'm in pain life is not fair.'

'Let the people you love know you love them as they can be taken from you.

'I'm so sorry Koah l couldn't save you. Love you forever.' 

Detective Acting Inspector Jason Smith told The Cairns Post, 'they worked on him for a significant period of time.' 

He is one of a number of detectives who are specialist officers who are travelling to the remote town on the Cape York Peninsula in Far North Queensland about 30km north of Cooktown, on Saturday.

Little Koah's mum issued a heartwrenching Facebook post after her little boy was killed by his own dad

Little Koah's mum issued a heartwrenching Facebook post after her little boy was killed by his own dad

Koah (pictured playing) was killed on Friday morning despite paramedics rushing to the scene to try and save his life

Koah (pictured playing) was killed on Friday morning despite paramedics rushing to the scene to try and save his life

'I'm so sorry Koah l couldn't save you. Love you forever,' his mum wrote on Facebook after the four-year-old (pictured) was killed

'I'm so sorry Koah l couldn't save you. Love you forever,' his mum wrote on Facebook after the four-year-old (pictured) was killed

Koah (pictured playing) was killed on Friday morning and his mum has posted a heartbreaking tribute

Koah (pictured playing) was killed on Friday morning and his mum has posted a heartbreaking tribute

A crime scene has been established and detectives have launched an investigation into the circumstances surrounding the deaths of Harvey, 46, and the boy. 

'We're

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