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Boston teen pleads guilty to 2018 manslaughter of 15-year-old in Cambridge

Richelle Robinson was found unconscious on a Cambridge sidewalk and pronounced dead the next day.

Isaias Plaza leaves the dock after his arraignment in Middlesex County Superior Court in 2019 on the charges of manslaughter.
Isaias Plaza leaves the dock after his arraignment in Middlesex County Superior Court in 2019 on the charges of manslaughter. –Pat Greenhouse/Globe Staff

A Boston teenager was sentenced to jail after pleading guilty to a manslaughter charge for the death of a 15-year-old girl with whom he had a falling out shortly before she was found unconscious on a Cambridge sidewalk, officials said Thursday.

Isaias Plaza, 19, was sentenced to 2 1/2 years in the House of Correction. He must serve two years and the balance will be suspended for five years, the Middlesex district attorney’s office said in a statement. Plaza must also undergo mental health and substance abuse evaluations upon his release, according to prosecutors.

On July 22, 2018, police responded to Cambridge Street at 6:30 p.m. for a report of a woman shoved to the ground. They arrived to find Richelle Robinson, of Cambridge, unresponsive and bleeding. An investigation revealed she had been walking to a friend’s house at the time, the statement said.

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