The Latest on the fatal stabbing of an 11-year-old Houston boy who was walking home from school (all times local):

2:50 p.m.

Family members of an 11-year-old Houston boy who was fatally stabbed while walking home from school say he had stayed late at his middle school to participate in a science club.

Josue Flores' 16-year-old sister, Sofia Flores, says, "He wanted to be a doctor, he wanted to help people."

Another sister, Guadalupe Flores, says her family is sad and confused.

A motive for the killing Tuesday wasn't immediately known but police say a murder warrant has been issued for 31-year-old Che Lajuan Calhoun of Houston.

Police say Josue was walking on a sidewalk near his home when a man approached and stabbed him several times in an "unprovoked attack."

Relatives say the boy wasn't carrying a phone, laptop or any other electronic devices when he was stabbed.

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9:15 a.m.

Houston police say an 11-year-old boy was fatally stabbed while walking home from school and that officers are searching for the suspect.

Investigators say Josue Flores was walking on a sidewalk Tuesday when a man walked toward him and stabbed him several times in an "unprovoked" attack. A murder warrant has been issued for the suspect, 31-year-old Che Lajuan Calhoun.

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

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 a Houston hospital.

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8 a.m.

Houston police have issued a murder warrant for a suspect in the fatal stabbing of an 11-year-old boy who was attacked as he walked home from school.

Police have identified 31-year-old Che Lajuan Calhoun as the suspect in the killing Tuesday of Josue Flores.

Sgt. Tommy Ruland has called the attack "unprovoked."

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

Police say Josue was walking on a sidewalk when a man walked toward him and stabbed him several times. 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 a Houston hospital.

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12:45 a.m.

Authorities say a young boy was stabbed to death while walking home from school in Texas.

Police say the boy was walking down a street in Houston on Tuesday afternoon when an unidentified man walking the opposite direction stabbed the child repeatedly before running away from the scene.

Relatives of the boy told local media outlets he was 11. Authorities have not released the boy's name or age.

Houston police Sgt. Tommy Ruland says the attack was "unprovoked." The suspect is still being sought by police, and the investigation is ongoing.