The family of a grandfather killed on his morning walk say they feel “let down” after learning the driver responsible could walk free after just 12 months behind bars.

Mark Trestrail, 73, was struck and killed near his Northgate home in Brisbane during his daily early walk in March 2024.

WATCH THE VIDEO ABOVE: Driver sentenced over death of Northgate grandfather

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The court heard 25-year-old Ryan Anderson Hassell had a cocktail of drugs in his system, including methamphetamine at toxic levels, when he got behind the wheel.

Hassell lost control of his 4WD, crossed onto the wrong side of the road, mounted the kerb and hit Trestrail, who was pronounced dead at the scene.

He initially told police he had been adjusting the radio and had consumed eight to 10 beers the night before.

Toxicology results later revealed a mix of methamphetamine and sedatives known as ‘benzos’, including diazepam, or Valium.

Hassell’s 4WD mounted the kerb and struck Mark Trestrail during his morning walk. Credit: 7NEWS

Ryan Anderson Hassell had a cocktail of drugs in his system, including meth at toxic levels, when he got behind the wheel. Credit: 7NEWS

Hassell pleaded guilty to dangerous driving causing death and was sentenced to five years in prison, to be suspended after serving 12 months.

Outside court, Trestrail’s devastated family said the punishment did not reflect the loss they continue to live with.

“Very disappointed… we came here to seek justice and we feel quite let down,” a family member said.

“He was loved, he was funny and he deserved to go out on his own terms, not by the actions of someone else.”

Mark Trestrail’s family speak outside court, saying they feel ‘let down’ by the sentence. Credit: 7NEWS

Remembered as warm and full of life, Mark Trestrail’s loss has left his family devastated. Credit: 7NEWS

The court was told Hassell had been on a good behaviour bond for drug possession at the time of the crash.

The judge acknowledged his efforts in rehabilitation and counselling but said a period of actual jail time was necessary.

Hassell has also been disqualified from driving for two-and-a-half years.

For Trestrail’s family, the sentence is one they say they will struggle to accept.

“It’s so wrong… it’s horrible,” they said.