Despite multiple arrests and a history of mental health problems, Ramon Rivera, accused of killing three strangers in a wild Manhattan stabbing spree, was never sentenced to more than a year in jail.

Three unprovoked stabbings across Manhattan Monday morning that left two men and one woman dead show how the criminal justice and mental health systems fail New Yorkers, the city’s mayor said. The suspect is 51-year-old Ramon Rivera – who appears to be homeless and has a history of “severe mental health issues,