Heather L. Frederick, 48, of Marengo (inset) who was a longtime teacher at Heineman Middle School in Algonquin, died at her home on Sunday. | Background Photo: District 158

An autopsy has been performed on a longtime Algonquin middle school teacher who died on Sunday and the coroner says foul play is not suspected in her death.

Heineman Middle School Principal Stephanie Mitchell last weekend sent a letter to the parents of Heineman Middle School notifying them about the death of Heather Frederick.

Frederick was the school’s physical education department leader and teacher.

Frederick was a part of the Huntley District 158 community for 21 years.

McHenry County Coroner Michael Rein said on Thursday that Frederick, 48, died at her residence in Marengo on Sunday.

She served as a physical education teacher at Heineman Middle School since its opening in 2005.

Frederick served as an “important and vibrant member” of the school community and “will be dearly missed across all of Huntley,” Mitchell said.

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Rein said that rumors of Frederick’s death being the result of a vehicle crash were false.

An autopsy was performed on the woman on Tuesday. “There does not appear to be any foul play involved with her death or any community safety issue,” Rein said.

Mitchell said the school recognizes the loss presents a challenging time for the entire Huntley District 158 community, especially the students.

Heineman Middle School said they have dedicated counselors and social workers who are trained to help with the needs of students, parents and school personnel.

Social workers from throughout the district are assisting in providing support.

“We know that grief can take shape in many ways, and we encourage you to please reach out for any additional support you or your student(s) may need at this time,” Mitchell said in the letter.

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Frederick’s obituary said she leaves behind a husband, children and a grandchild.

Rein said toxicology results are still pending in the investigation.