Another arrest has been made in the death investigation of Effingham County teens Elwyn Jr. and Mary Crocker.

Mark Anthony Wright, 31, has been arrested and charged with Cruelty to Children in the first degree, according to the Effingham County Sheriff’s Office (ECSO).

ECSO says Wright lived at the Guyton home where the children were found dead and buried in December. He is the brother of Candice Crocker, the children’s step-mother, who has also been arrested.

This is the fifth arrest made in the ongoing investigation.

Authorities say 14-year-old Mary had not been seen since October of 2018. Elwyn Jr. had not been seen since Nov. 2016.

Investigators tell News 3 initial autopsy results did not reveal the cause of death.

Anyone with information on the investigation is asked to call ECSO at 912-754-3449.