UPDATED | May 18, 2016 3:22 PM

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HOUSTON (CBSDFW.COM/AP) — Police in Houston have arrested Che Calhoun, 31, for allegedly fatally stabbing an 11-year-old boy who was walking home from school.

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Investigators say Josue Flores was walking on a sidewalk Tuesday when Calhoun walked toward him and stabbed him several times in an “unprovoked” attack.

Police provided no information Wednesday on a possible motive or relationship between Josue and Calhoun.

Josue’s sister, Sophia Flores, says she still can’t believe her brother is gone. “It feels like a person stabbed me in my heart. I always talked to him about my problems. He always talked to me about his problems.”

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Witnesses reported seeing the man and the boy struggle before the child collapsed onto some grass, then the suspect ran. A bystander flagged down police.

Josue was pronounced dead at the hospital.

Calhoun is charged with murder in the case.

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