A 70-year-old Brooklyn man was fatally stabbed eight times in the chest when an ongoing feud with a much-younger neighbor boiled over Monday, cops and law-enforcement sources said.

Fredrick Howard was killed during the fight with 31-year-old Josny Jean inside a multi-family home that both men lived in on East 87th Street near Avenue M in Canarsie, according to authorities and sources.

The gravely injured Howard went by private means to the Brookdale University Hospital Center, where hospital staff called the cops around 1:10 a.m., police said.

Canarsie resident Fredrick Howard, 70, was fatally stabbed in the chest during a clash with his much-younger neighbor in a home where they both lived, cops and sources said. Google Maps

Josny Jean, 31, was arrested and charged with murder and cr

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