Five people have lost their lives in as many days in the Griffith area, with an 87-year-old man the latest in the tragic string of accidents.

A 21-year-old man tried to save his 87-year-old grandfather's life on Monday afternoon after he became trapped under a grain trailer at a Benerembah property. 

The young man attempted to shift the trailer by trying to move it with a forklift.

Unsuccessful in his efforts, the grandson rushed for help, alerting a neighbour who called emergency services.

Police have been told the trailer had just been uncoupled from a tractor and the elderly man had tried to steady it before he became stuck under it.

Emergency services were called to the Woodside Road property about 3.30pm, where the grandson met them and directed them to the accident site.

A crime scene was established and investigations commenced. Work Cover has also been notified.

This man's death comes in the wake of three men losing their lives in and after a car accident between Merriwagga and Goolgowi, and the drowning of a toddler in Griffith.

An 18-month-old girl died after she was found in a backyard pool in Griffith's Binya Street on Sunday afternoon.

The toddler was unresponsive when paramedics arrived and despite emergency department staff at Griffith Base Hospital working to revive her for an hour, she passed away.

Eight people were in a Toyota Prado when it rolled a number of times 55 kilometres north of Griffith on the Kidman Way on Friday morning.

Two passengers died at the scene, and another two were airlifted from the scene in critical condition.

A third man, aged 31, died from injuries on Saturday. Two more passengers remained in hospital in a critical condition.