The report said investigators asked Garsteck to take a DNA test to eliminate him from suspicion but he refused.
Strasnick said Garsteck also denied having had any cell phone conversations with the girl or her mother. Evidence shows otherwise, Strasnick said.
“There are thousands of text messages between this defendant and this child,” Strasnick said. “There are text messages between this defendant and the child’s mother, and there are text messages between this defendant and what appears to be another juvenile, who is in the process of being identified.”
She said the messages between Garsteck and the victim were “graphic and sexual.”
“I know we’re familiar with the term ‘sexting,’ but I suggest that ‘sexting’ is a gross understatement for the content of the defendant’s text messages,” she said. “They truly shock the conscience that an adult would text such graphic details to a child.”
Strasnick read aloud one of those text messages, which was vulgar and sexual and raised the eyebrows of those in the courtroom.
She said the texts also pointed to Garsteck being aware of the investigation and taking steps to cover up his crimes.
Police said investigators interviewed the victim on Oct. 3 while she was in a Boston hospital preparing to give birth. Labor was to be induced on Oct. 6, the police report said. It is not known whether the baby was delivered at that time.
The girl told police that her relationship with Garsteck began at the end of last year. She said it began with kisses that led to sex several times in January and February.
The girl told investigators she and her mother did not want to talk to police about Garsteck because they wanted her child to have a father and someone to provide child support.
Police arrested Garsteck on Monday.