Judy Rodriguez keeps photographs, candles, and flowers at the spot outside her home in Braintree where her 16-year-old son and another teenager were shot to death. Two years after that night, she’s still waiting for answers.

“I want them to get to the bottom of this,” Rodriguez said. “I want to rest easy knowing that we caught the people who did this. I want them to do their damn job.”

The murders of her son, Jahzier Les Porter, and Jayden Santos-Andrade, 19, are among 10 unsolved killings under investigation by the State Police unit attached to the office of Norfolk District Attorney Michael W. Morrissey — the same squad in the two controversial investigations of Karen Read and Sandra Birchmore .

And while Morrissey’s office has a high rate of resolving homicide cases compare

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