Early on Saturday, the amber alert was cancelled when authorities located the toddler safe in Monterey, Tennessee, 800 miles away. They arrested his father without incident.
But at 8:15 PM that night, police discovered Yasemin's body in a wooded area nearby, off of Interstate 40, USA Today reported.
Rios is charged with first-degree kidnapping in connection with the abduction of his son; additional criminal charges are now pending in connection with the death of the boy's mother.
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According to the publication, in October 2019 Yasemin's mother Karen Uyar wrote a post on social media detailing her daughter's abusive relationship with Rios, claiming multiple instances of domestic violence, and the steps the family had to go through to get her protection.
Weeping for her daughter on Saturday, she alleged Rios had previously choked Yasemin, and slammed her head into a wall.
"While my family grieves the loss of Yasemin, please remember she wasn't just a DV (domestic violence) victim," Karen Uyar said. "Her life will be celebrated as her greatest gift to this world, Sebastian will still need all of our love and support."
She said she last saw her daughter alive on Wednesday, and she had seemed fine. But she knew something was terribly wrong when police left a voicemail for other daughter Marissa on Friday, alerting her that Yasemin had been assaulted.
According to court records obtained by NJ.com, Rios was charged with aggravated assault and strangulation of a domestic violence victim and theft in 2018. He pled guilty to the domestic violence assault charge and was sentenced to 180 days in jail and three years of probation, but as part of a plea deal, had the strangulation and theft charges dropped.
He was also ordered not to have contact with the victim — who was not identified as Yasemin — and to undergo anger management classes.
Karen said she repeatedly told her daughter she lived in constant fear that one day she would receive a call with the worst possible news — but that her daughter always downplayed it.
"She would say, 'He really wouldn't hurt me. He just wants control.'"
Rios remains in custody in Tennessee, pending extradition back to New Jersey.