Two groups of teenage boys and young men planned to meet at the train station around 11.30pm that night when an argument broke out, police say.
Aguer and his friends were then chased, with their attackers carrying weapons like sticks, fence posts and knives and the 17-year-old was assaulted.
After being assaulted, Mr Akech escaped up a train platform and across rail lines before succumbing to his injuries.
Emergency services were called about 1.30am but he died at the scene.
The other group fled in three vehicles, including the silver 2005 Holden Commodore sedan that was the subject of their dispute. The car has the South Australian number plates S111 AZI.
The two other cars are a 2010 silver Honda Accord and a 2019 white Hyundai Tucson.
Ten people were arrested at the time but they were all released pending further inquiries.
Police have since found the silver Commodore that was taken at the soccer game and it is being forensically analysed.
Anyone who saw or heard suspicious activity in the area between 11pm and 2am on December 21 to 22 has been urged to come forward.
Homicide detectives have released CCTV of the African teenage boys and young men, possibly aged into their early 20s, in the hopes of identifying them.
“At this stage we don’t know if any of the males in the CCTV were involved in the fatal stabbing,” Detective Inspector Tim Day said.
“Because they were in the vicinity of the station at the time of the incident it’s possible that they were part of either group involved, or they may simply be valuable witnesses for our investigation.
“Either way, it’s crucial that we identify these people and speak to them.”
Aguer’s mother Aluel Mayola said her son had spent time in youth detention but that he had turned his life around before he was fatally attacked.
“I was [in] shock … I didn’t know he would die like this,” Ms Mayola told Nine News last year.
Mr Akech was active in church and sporting groups, and working at Tarneit McDonalds. His family said he was a strong support to his mother and was fast becoming a role model in the community.
Family and members of Melbourne’s African community believe Mr Akech’s refusal to be part of further violence made him a target.
“He was a victim of refusing to be part of the bad boys,” family friend John said. “A few other kids told him if you are not part of this your life is at risk.”
Anyone with information is urged to contact Crime Stoppers on 1800 333 000 or submit a confidential report at www.crimestoppersvic.com.au.
Rachel is a breaking news reporter for The Age.