Grim new details have emerged in the case of a missing California infant as the young boy's parents appeared in court to face charges for his murder.

Jake Haro, 32, and Rebecca Haro, 41, appeared in court without representation on Tuesday, when they were formally charged on one count each of murder with malice and making a false police report, a misdemeanor, according to the Los Angeles Times.

The couple have been accused of lying about their seven-month-old son Emmanuel Haro's disappearance after they pleaded on television with locals to help them find their child.

Rebecca had claimed she was attacked from behind in front of a Big 5 retail store in Yucaipa on August 14.

She told police she regained consciousness with a black eye and no memory of what had happened, before realizing her son was missing.