The Los Angeles Times reported that Pardo had kept his son's existence and condition a secret from his wife.
Police have said Pardo targeted his rampage at his former wife, Sylvia Ortega Pardo, and her family at the family's Christmas Eve party.
Just when the Ortegas were celebrating while enjoying a family Christmas dinner at their Covina, California, home, a man dressed in a Santa suit knocked on the door and shot the first person who answered, an 8-year-old little girl.
The man was 45-year-old Bruce Pardo, an angry ex who wanted revenge on his former wife, Sylvia Pardo.
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New evidence shows that had Bruce Prado not caught himself on fire more murders would have taken place.