Police have charged a 15-year-old boy over the murder of Indian student Nitin Garg in Melbourne earlier this year.

The 21-year-old was stabbed in a park at Footscray West in January as he walked to work at a fast food restaurant.

His murder sparked outrage in India and raised concerns the attack was racially motivated.

Police questioned the 15-year-old after arresting him this morning.

He has been charged with one count of murder and will face the Children's Court later today.

Police have refused to speculate on a motive for the attack, but do not believe it was racially motivated or gang related.

Police says they have spoken to several other people in relation to the incident and the investigation is continuing.