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Mar 5, 2016 9:41 AM

Prosecutor: Morin used heroin the night Brielle Gage died

NASHUA - The night Katlyn Marin allegedly beat her 3-year-old daughter to death, she used heroin, prosecutors say.

According to The New Hampshire Union Leader, court documents filed in Hillsborough County Superior Court South allege that Marin was also committing welfare fraud and that she had considered placing her daughter, Brielle Gage, up for adoption.

“Discovery in this case reveals that (Marin) used heroin on the night she killed Brielle Gage, and at times before,” Jeffery Strelzin, senior assistant attorney general, said in court records filed Tuesday.

Michael Rivera, Marin's ex-boyfriend, told police that she was using heroin that night, and is a key witness for the prosecution in the case.

The defense claims that Marin was a confidential police informant and that may color his testimony.

“Michael Rivera's past experience as a confidential informant sheds light on his biases, motives and ultimately his ability and requisite knowledge to manipulate the criminal justice system,” said Attorney Justin Shepherd in court records.

Marin denied that she had any involvement in Brielle's injuries and called 911 to report her daughter was unconscious. She said a fall killed Brielle.

Court records say that Brielle, who would have turned 5 earlier this year, had injuries consistent with battered child syndrome.

Jury selection will take place Aug. 1.

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