Maria Roque was shot several times Wednesday morning outside a home on North Long Avenue, Chicago police said.
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The victim's twin brother, Andres Roque, spoke to ABC7 Sunday about her murder and the investigation.
"I'm feeling hurt and broken," Roque said. "I loved the person I called everyday."
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The mother, who was 34, leaves behind a son and a daughter.
"She was always lovely. She would always help other people," Roque said. "She would give so much."
Police have not made any arrests and detectives continue to investigate.