A man in his 90s is speaking with police after the body of his neighbour was found on a street in Reservoir, in Melbourne's north, this afternoon.
Emergency services were called to Joffre Street around 12.30pm after a man in his 80s suffered a suspected heart attack.
His neighbour is currently being questioned by police in relation to the death.
It is understood there had been some animosity between the neighbours in the past.
"He shouldn't have died that way. We don't know what's happened," the victim's sister-in-law Rita told 9NEWS.