Major Collision Investigation Unit detectives yesterday interviewed a man following a death in Kiata last week.
A passerby located human remains on the Western Highway just after 8am on Friday, April 4.
The deceased is yet to be formally identified at this stage.
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The cause of death is also yet to be determined but is being treated as a possible hit and run at this stage.
Detectives located a truck in Tullamarine today and have seized it for forensic testing.
A 33-year-old South Australian man, believed to be the driver, has been interviewed and released pending further enquiries.
