Surprise! Alcohol was involved.
Franciso Perez, 56, allegedly plunged a knife into the torso of Luis Gonzalez, 63, at around 9:30 p.m. during a tussle at their home on West 105th street near Columbus Avenue, according to cops.
The older sibling was found lying on the floor of their first floor pad, and declared dead at the scene.
Family members told police the brothers have squared off in the past, especially when Gonzalez hit the bottle.
Both brothers had lengthy rap-sheets, and now Perez can add a murder charge to his.