The father confronted the 64-year-old man, identified as José B.R., in the street on Friday and got into a fight with B.R., accusing him of sexually abusing his disabled daughter a year ago, according to local newspaper Écija al Día.
The young girl's father then punched the alleged abuser so hard that he fell to the ground and hit his head, causing him to be severely injured.
The man was then taken to San Sebastián de Écija Hospital, but because his injuries were so bad and he suffered two cardiac arrests, he was transferred to Virgen del Rocío hospital in Sevilla, where he died on Saturday.
The father of the girl was arrested on Friday and is charged with assaulting the man, though sources told Écija al Día that these charges could turn into homicide charges.
In February a British father killed a man in Sotogrande whom he suspected of secretly filming his young daughter.