Heather Carpenter, 42, (pictured) has been charged with third-degree felony mischief after she admitted to smearing feces on tables and grills where a young student's birthday party was being held in December

A Florida substitute teacher has been charged with third-degree felony mischief after she smeared human fecal matter across a pavilion where a young student's birthday party was being held.

Heather Carpenter, 42, who was hired in October 2017 as a substitute teacher at Phillippi Shores Elementary in Sarasota, admitted to the disturbing December 1 act that took place at Urfer Park.

Law enforcement officials learned about the incident after a witness called police early that morning.

The birthday party was scheduled for later that day.

The witness saw Carpenter wearing rubber gloves and a face mask at the time she smeared fecal matter across seven picnic tables and two grills.

Her reasoning was to settle a score with Phillippi Shores Elementary Principal Allison Foster, who was hosting the party for her daughter.

Foster had invited all of the students in her daughter's class, including Carpenter's child.

The disturbing incident happened December 1 at Urfer Park in Sarasota

Carpenter later admitted to law enforcement officials that she was upset with how Foster handled a recent complaint.

Phillippi Shores Elementary could not release details on the nature of the complaint.

According to WWSB, the cost for Sarasota County to replace the tables and grills totaled $2,310.

Police are currently investigating the substitute teacher.

She has been banned from working or volunteering at the school in the meantime.

Carpenter's reasoning was to settle a score with Phillippi Shores Elementary Principal Allison Foster, (pictured) who was hosting the party for her daughter