Julie Hoover was previously arrested for sexting a student in her class after the teenager's mother found explicit messages on his phone from the teacher.
Melanie M. Biggins, 40, told investigators she wanted to leave her husband for another man but divorce was not an option due to their financial struggles.
The mother, identified as Victoria Sahayarani, told cops that she intentionally poisoned the 13-year-old boy because he performed better than her daughter in class.
A witness who saw the disturbing video on Snapchat reported the father-daughter duo to local law enforcement. They have been charged with aggravated animal cruelty.
Eric Harris, a Pasco County Sheriff's Office deputy was let go from his role following his arrest over the incident. He is now facing felony animal cruelty charges.