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DES MOINES, Iowa – An arrest has been made in the death of a Des Moines two-year-old back in May.

Des Moines police say 37-year-old Nicholas Rivera has been charged with child endangerment resulting in death in connection with the death of Calvin Trullinger.

The child was brought to Mercy Medical Center in the early morning hours of May 24th and died later that day.

At the time, the boy’s mother told Channel 13 that he died from lack of oxygen following a seizure. She also referred to him as Calvin Risius. According to the child’s father, Matthew Trullinger, Sr., Calvin’s legal last name is Trullinger.

The criminal complaint against Rivera refers to the child as “C.T.”

Rivera turned himself in to authorities late Thursday night. He is being held in the Polk County Jail.

Police have not released many details about the boy’s death but say they expect to make another arrest in the case.