An eyewitness said the woman was running down the street, trailing blood. Her husband was reportedly following in an SUV.
A witness said the suspect got out of the vehicle and yelled at the victim before "punching her with a knife, all over her body."
The woman passed out on a driveway, where she was later pronounced dead.
The suspect was taken into custody without incident.
The incident occurred on Sedona Drive in the Higgins Ranch neighborhood of /*Chino Hills*/.
The man and woman are reportedly married and have three children together. A neighbor said the man had moved out of the couple's house about a year ago.
The names of the suspect and victim were not released.