Detectives from Mitchell Crime Investigation Unit are seeking information into the final movements of Jodus Murphy.
The 18-year-old went missing from Frankston on May 12 and investigators believe he made his way to Seymour shortly after.
Jodus was located deceased beside the Goulburn River on June 14.
Investigators are keen to speak to anyone who may have seen or had any interaction with Jodus between May 13 and June 14.
His death is not believed to be suspicious.
Anyone with information is urged to contact Crime Stoppers on 1800 333 000 or to submit a confidential report at www.crimestoppersvic.com.au