A California father was stabbed to death in broad daylight while walking hand-in-hand with his 8-year-old son just moments after picking him up from school, cops say.

"The homicide was horrific," said San Francisco Police Department interim Chief Paul Yep during a press conference Friday after the arrest of Robert Byrd II's alleged killer.

"A father who was walking across the street with his son was fatally stabbed in the crosswalk after getting into an altercation with the suspect," Yep told reporters. "Immediately after this incident occurred, our officers began a tireless investigation to identify and apprehend the suspect. We were relentless."

Byrd had just done "school pickup" for his son at nearby Commodore Sloat Elementary School in San Francisco on Wednesday when he was attacked

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