A father has died after assaulting his son with an axe in Melbourne’s north-west this morning.

Police were called to reports of a fight between two men, aged 20 and 57, at a home on Carey Court, Sunbury, around 9.30am.

The father's body was located in a car near where the fight unfolded. Picture: 9NEWS (9news)

9NEWS understands the younger man was assaulted by his father before running to Ruyton Court where he received help from tradesmen, who dialled Triple-Zero.

“He was covered in blood and asking for help. We told him ‘you're safe’, and called emergency services,” one of the workers said.

The 20-year-old suffered serious but non-life threatening upper-body injuries and was taken to the Royal Melbourne Hospital in a stable condition.

Police remain at the scene in Sunbury. Picture: 9NEWS (9NEWS)

The elder man's death is not being treated as suspicious, police have said. Picture: 9NEWS (9NEWS)

His father was then found dead in a parked car on Powlett Street just before midday.

Detectives are not treating the death as suspicious and will prepare a report for the Coroner.

Readers seeking assistance can contact Lifeline on 13 11 14, the Suicide Call Back Service on 1300 659 467 or MensLine Australia on 1300 78 99 78.