The man, identified as Jose David N., was caught on surveillance footage repeatedly throwing the young girl into a hotel pool in the city of Morelia, located in the state of Michoacan.
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She is seen battling to keep herself afloat, while the murderer stands at the side of the pool doing nothing.
The abuse reportedly occurred while the mother was sleeping in the family’s hotel room.
Jose David N. claimed to the court he had not expected the youngster to drown.
It caused outrage in South America after the footage was made public previous year.
The little girl died shortly afterward with the autopsy conducted at the hospital showing she died from secondary drowning.
The killer remained silent throughout his trial and did not give testimony.
The prosecution asked for a 40-year sentence. However, after reviewing the CCTV footage, the judge slapped the accused with a more severe punishment – 100 years in jail.
In another clip the child can be seen with her arms flailing in the air as he throws a lifebuoy to her, however she is unable to grip it.
According to the footage, at one point he threw her in and walks away returning to toss her back in when she is fully-clothed.
His defence had suggested the girl died outside the water, a submission rejected by judges Juan Salvador Alonso Mejia, Ana Lilia Garcia Cardona and Noe Reyes Millan.
Judge Garcia Cardona, who read the sentence said that not only did the man throw the toddler into the pool several times, he also dragged her hair under the water and held her body in such a way that she was unable to breathe.
He then holds the girl under the water for nearly a minute, before roughly pulling her out of the pool by her arm.
Shocking video footage shows the bulky stepdad jumping into the pool with the girl then letting go of her once in the water.
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The stepfather was arrested, detained by the police and arraigned in court.
