Police believe a 91-year-old female driver lost control of a Toyota Yaris on Coleman Road in Wantirna South about 12.20pm (AEST) on Thursday, ploughing through a fence and coming to a stop at a park bench.

A 59-year-old woman died at the scene, a 60-year-old man was rushed to hospital with life-threatening injuries and a two-year-old boy was seriously injured.

The man, 60, has now died of his injuries, police confirmed.

Police said the driver remained in hospital with minor injuries.

She has not yet been interviewed and an investigation into the circumstances of the crash is still under way.

It’s believed the vehicle travelled out of control for about 50 metres before mounting a footpath and striking the adults, both from Wantirna South, and the child, from behind.

Aerial footage showed emergency services setting up a tent to cover the car in a park, immediately adjacent to play equipment.

“We haven’t got a lot of details from the driver. The driver’s suffered some very minor injuries, but obviously terribly shaken by the incident which is why we’ve taken the driver to hospital for assessment,” Superintendent Justin Goldsmith said last week.

It was unclear whether the driver suffered a medical episode, Goldsmith said.

“We don’t have enough information to say whether speed was a contributing factor,” he said.