A woman who reported finding the bodies of her husband and two boys in their Rowland Heights home was charged Friday with their murders, authorities said.
Manling Williams, 27, was arrested Wednesday and held without bail.
She faces three counts of murder.
She made her first court appearance Friday, but her arraignment was postponed to Aug. 31.
Authorities said Williams told them that she discovered the bodies of her husband, Neal, 27, and their sons Devon, 7, and Ian, 3, when she returned from shopping early Wednesday.
But investigators said she gave a different account of her activities to a neighbor.
Williams allegedly told the neighbor she had gone for a drive late Tuesday to cool off and found the bodies when she returned the next morning.
Authorities also didn't find any sign of forced entry into the family home.
A motive for the crime hasn't been determined.
According to the criminal complaint, Williams' husband was stabbed to death with a sword and the children were smothered with a pillow.
Special circumstances of lying in wait and multiple murder were also charged.
The district attorney's office will decide later whether to seek the death penalty.
Rowland Heights is an unincorporated county area about 30 miles southeast of downtown Los Angeles.