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TULLYTOWN BOROUGH, Pa. (CBS) — A mother has been charged in the poisoning death of her 2-year-old son. Authorities say 42-year-old Jennifer Clarey put Vicodin in her son’s sippy cup last month inside a Bucks County home.

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Authorities say Mazikeen Curtis was found dead inside a home on the 500 block of Lovett Aveune on Tullytown Borough on Aug. 25. Bucks County District Attorney Matthew Weintraub said Tuesday that Clarey has been charged with criminal homicide in the boy’s death.

Authorities believe Clarey intentionally gave the toddler a lethal dose of Vicodin, forcing his body to overdose. They believe she may have gotten the child to take the opioid drug by putting it in his sippy cup.

“We sent his sippy cup to the lab and the sippy cup and the contents of the sippy cup, the remains that were inside — the liquid contents — did reveal the presence of Vicodin, which little Mazikeen also had in his system, at a toxic level,” said Weintraub. “Plain and simple, this was a murder and the weapon was the pills that came from this bottle.”

Authorities say the Vicodin was prescribed just days before her son’s death. The bottle was filled with 120 pills, but investigators did not find a single pill inside it.

Weintraub says they do not yet have a motive yet in the boy’s death.

“As to the motive, we are not really sure. We cannot speculate on it, but certainly what I am able to tell you is that his mother, Jennifer Clarey, will be made to answer for Mazikeen’s murder,” said Weintraub.

Clarey had nothing to say as she was arraigned in court on Tuesday afternoon.

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She is being held without bail.