A man was found fatally stabbed in a Brooklyn apartment Sunday, authorities said.

The 54-year-old victim was stabbed in the head multiple times after an argument with another unidentified person inside the home at 194 Grant Ave. in Cypress Hills around 2 p.m., cops said.

The victim was rushed to Brookdale Hospital, where he was declared dead.

There have been no arrests, and it remains unclear what triggered the violence.