A shocking murder is being investigated by Richland police.

Authorities say around 11:30 p.m., two small children ages two and six went to a neighbor's house on Dos Palos Court in Richland to tell the people their mother was dead.

Police found 32-year-old Rebeca Vandeventer in her home with multiple stab wounds to the chest. While police were at the scene, 34-year-old Lawrence Arnold Miller showed up and told the officers he believed he had killed his girlfriend.

He has been booked in the Benton County Jail and is expected to make a court appearance Sept. 12. Some reports indicate Miller was her ex-boyfriend and he allegedly stabbed her over being upset about her new boyfriend.