Demario was a 10th-grade student at Johnson College Prep, according to Principal Garland Thomas-McDavid.



In a statement, Thomas-McDavid said Demario had an identical twin who was with him when the shooting happened.



Thomas-McDavid said Demario's brother plays varsity basketball and called Demario his biggest fan. He regularly accompanied his brother to practices and games at the charter school.



"In addition to mourning this loss, (Demarios' brother) will also be forced to live with the horrible memory of watching his brother be murdered in front of him," Thomas-McDavid said.



She said the latest killing showed the need for something to be done to keep children safe on the streets.



"I know I speak for every educator who continuously deals with this type of tragedy in saying we are sick and tired of being sick and tired. The apologies are not enough, and after all the fanfare is over, someone still has to put their baby in the ground," Thomas-McDavid said in the statement.



She called for increased levels of security so people do not have to live with the "constant threat of being killed."



Thomas-McDavid said as educators, she and others are in the field to provide a "brighter future" and not to deal with children being "victimized over and over again."



"I believe I speak for every mother who lives on the South Side of this city in saying we don't mind if it takes (martial) law to get this in order. Demario did not deserve to die three days from his 16th birthday," she said.