A maniac with 13 prior busts stabbed a city schools worker to death and repeatedly slashed his buddy during an unhinged attack on a Bronx street on Wednesday, cops and sources said.

Rashaun Shettlewood, 32 — a paraprofessional for the city’s Department of Education, according to law enforcement sources — was knifed once in the chest and his 33-year-old pal stabbed repeatedly in the torso around 3:30 p.m. at Davidson and West Tremont avenues in Morris Heights, police said.

Both were taken to St. Barnabas Hospital, where Shettlewood — who lived about a mile from the scene — succumbed to his injuries and the older man was listed in stable…

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