The man accused of gunning down three people at a Bronx apartment building was a disgruntled tenant who lost his temper during an ongoing dispute with neighbors over their shared backyard, according to law enforcement sources.

Jimmy Avila, 44, was arrested Wednesday after blasting away at three men around 8:30 a.m. on College Avenue near East 170th Street in Mount Eden — striking a 37-year-old in the chest, hitting a 59-year-old in the buttocks and shooting a 62-year-old in the arm.

The 37-year-old later died of his injuries, but the other two were hospitalized in stable condition.

Jimmy Avila, 44, was arrested after barricading himself inside an apartment. News 12

Avila barricaded himself inside an apartment — and called a local news station and confessed — before he was eventual

See Full Page