Edna Figueroa, 3, was brought to the Rockdale Medical Center Emergency Room by her mother Yaneth DeLaCruz Alvarez and the mother's boyfriend, Raul Solis, on Saturday.
Figueroa was unconscious, unresponsive and having difficulty breathing when she was brought into the ER.
Doctors say the toddler suffered from extensive brain hemorrhaging. She died the next day from her injuries.
Tuesday, police arrested Alvarez and Solis in connection to the little girl's death.
Solis was charged with murder and cruelty to children.
Police said Solis admitted to shaking the 3-year-old while she was misbehaving.
The girl's mother, Alvarez, has been charged with cruelty to children for failing to supervise her children, which led to Figueroa's death.
Alvarez and Solis are currently being held in jail.