A 37-year-old woman and a 12-year-old boy have died after a truck collided with their vehicle on the Murray Valley Highway in Brimin on Friday night at about 9.30pm.
The truck driver has been identified as a 31-year-old Mooroopna man and has been interviewed and released pending further enquiries.
The remaining occupants of the car, a 44-year-old man, a 2-year-old boy and an 8-month-old boy remain in hospital in a critical condition.
Major Collision investigation unit detectives continue to investigate the double fatality.
Anyone who witnessed the collision is urged to contact Crime Stoppers on 1800 333 000 or submit a confidential report at www.crimestoppersvic.com.au