DALLAS(CBSDFW.COM) – A two-year-old Irving boy is dead and police have arrested his Stepfather with his murder.

The investigation started Wednesday when toddler boy was rushed to Children’s Medical Center.

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The boy’s stepfather, 25-year-old Michael David Mercado called 911.

According to police records he told the operator his son had a seizure.

Doctors quickly discovered his son had in fact suffered severe head injuries and was placed on a ventilator.

Investigators say Mercado was home alone at his Irving apartment with his stepson for five hours on Wednesday when he called 911.

His next-door neighbor told said he never thought Mercado was capable of the crime he’s been charged with.

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“Every time I met him he was always polite, very calm, had no idea something like this could happen.”

Friday the two-and a half year old boy died at Children’s Medical Center. After his death his step-father was arrested for capital murder.

This investigation is still in its early stages.

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