Crime Tape
A representational image of a crime scene. Getty Images/ Christopher Furlong

Details about the murder of three Michigan children were revealed Sunday with investigators saying that the mother used a forged doctor's note to get her daughters out of school. Aubrianne Moore, 28, fatally shot her children on Feb. 18 before killing herself in her boyfriend's driveway.

On the day of the tragedy, Moore showed up at the children’s school in the middle of the day to pick up her daughters — Alaina Rau, 2, Cassidy Rodery, 6, and Kyrie Rodery, 8, Kent County Sheriff’s Office detectives said. She provided the teacher with a “doctor's note” which was later found to be fake.

The mother's former social worker had warned about her behavior last September in a petition to the Newaygo County Probate Court.

“Aubrianne is keeping her kids home from school because the television told her there would be a school bus accident today,” the social worker wrote, as WYFF reported. “Aubrianne stays awake at night believing people will break into her home. Aubrianne is not eating believing food is being poisoned.”

“I believe the individual has mental illness and as a result of that mental illness the individual can reasonably be expected within the near future to intentionally or unintentionally seriously physically injure self or others,” the social worker added.

Investigators said Moore drove the girls out to a wooded area behind their great-grandparents' home and lured them from the car one-by-one. She then shot them with a hunting rifle before driving back to her boyfriend's house and killing herself outside the vehicle, WOOD TV reported.

"I've been with the sheriff's department for 29 years," Kent County Sheriff Michelle LaJoye-Young said. "This is one of the hardest cases I've ever hear about. This is a very difficult case. Our investigators are feeling it. It's heartbreaking that something like this happened in our community."

"We don't know what was going through her head, she didn't leave a suicide note or anything like that," LaJoye-Young told MLive last week. "Mom appears to have been struggling with pretty substantial mental health issues... She had some postings on Facebook and things like that that lead to believe she was paranoid and thought that the kids were in jeopardy somehow."

Tri-County Area Superintendent Allen Cumings wrote in a letter: "Cassidy's teacher mentioned she was hard-working and friendly... Kyrie's teacher also noted her love of reading and said she often volunteered to help others."

A GoFundMe page was set up by the girls' uncle Joseph Graham to cover funeral costs.