A California man pleaded guilty Tuesday to killing his 5-year-old son after a family trip to Disneyland, setting off a search for the boy that lasted more than two months before his body was found near a lake.Prosecutors contend Aramazd Andressian Sr., 35, killed his son, Aramazd Andressian Jr., to get back at his estranged wife. Investigators have refused to say how the boy was killed or what evidence linked the father to the boy's death.The boy's mother, Ana Estevez, was loudly weeping in the front row of the courtroom as she held the urn with her son's ashes. She was surrounded by family members â?? all holding hands and...