Selvin Chajon Rodriguez asked the mother of his young children to marry him.
But if she said no, the couple and their son and daughter would "all be laid to rest."
The alleged threats, detailed in court papers filed last week in Riverside County Superior Court, were enough for Laura Reveriano to request a restraining against her ex-boyfriend.
"Selvin called and told me he would follow me to the end of the earth and he would kill the kids if they are not with him and there would be nowhere I could hide," Reveriano wrote in the request for a domestic violence restraining order filed Aug. 27.
But the temporary restraining order she was granted the next day did little good.
Early Thursday, Reveriano, 25, and her children, Selvin Chajon, 4, and Emily Chajon, 1, were found stabbed to death in her home on a quiet cul-de-sac in west Riverside.