The mother of the detainee who died while in custody at Delaney Hall told New Jersey Monitor that she is "destroyed" by her son's death. Andy Kim, D-N.J., said that Cornejo died from a heart attack. ALSO READ: Delaney death raises oversight questionsMother: No word from ICE or GEO GroupCornejo told New Jersey Monitor she has not heard from GEO Group, the operator of Delaney Hall, or ICE about her son's death. He was a good son,” Maria Cornejo told New Jersey Monitor. Family members, faith leaders and immigration advocates will hold a press briefing to demand an investigation into medical care and conditions at Delaney Hall.