49-year-old Espinal fed his 5-year-old son and 7-year-old daughter with pizza laced with rat poison because he was angry with his estranged wife.
Latest.com reports that after learning that his estranged wife was seeing another man, Espinal took out his anger on his children.
The little girl, named Mia, vomited after eating the pizza. When her little brother, Steward, soiled himself, Espinal took him to the bathroom.
He placed the boy in the bathtub and submerged him in the water. He then called his estranged wife and said that it was her fault.
The woman made a desperate call to Espinal's stepmother, who contacted police.
Officers broke the bathroom door and found Espinal in the bathtub cradling the lifeless, naked body of his son.
The 5-year-old boy died from a combination of rat poison and being submerged in the water. The 7-year-old girl was found sleeping in her own vomit on the couch.