LOS ANGELES, California (CNN)  -- The man who police say dressed as Santa Claus and killed nine people at a Christmas Eve party lived with guilt from an incident that left his son from a previous relationship a paraplegic, according to an attorney who once represented the woman in that relationship.



Bruce Jeffrey Pardo went on a shooting rampage in a Los Angeles suburb on Wednesday, police say.



Prime suspect Bruce Jeffrey Pardo, who police said committed suicide hours after he went on a shooting rampage and started a raging house fire in the Los Angeles suburb of Covina, had a son who sustained severe brain damage several years ago in an apparent swimming pool accident while he was in Pardo's care, according to attorney Jeffrey Alvirez.



Police have said Pardo targeted his rampage at his former wife, Sylvia Ortega Pardo, and her family at the family's Christmas Eve party.



The Los Angeles Times reported that Pardo had kept his son's existence and condition a secret from his wife. When she found out, her anger over the situation and also finding out that Pardo had claimed the child as a tax dependent for several years became a major factor in divorce proceedings, the paper said, quoting an unidentified source close to the investigation.



Covina Police Chief Kim Raney said Friday that a divorce between the two was finalized in court December 18 in a "somewhat contentious proceeding."



On Saturday, Covina police released the names of the nine people unaccounted for since the shooting and fire. Nine bodies were recovered from the rubble of the house, but authorities said they are having to work with dental records to establish identities.



"The bodies were so badly burned they cannot be identified any other way," Covina police Lt. Pat Buchanan said.



The nine unaccounted for are Sylvia Pardo, her parents, her sister, her two brothers, both brothers' wives and a nephew. Ages of the nine range from 17 to 80, police said.



Police said Sunday a car believed to have been rented by Pardo on December 19, a gray Toyota RAV4, was found in the Los Angeles suburb of Glendale. Authorities had cautioned the missing car might be booby-trapped or contain explosives, but it was unclear whether any had been found.



Another rented car that Pardo used to flee the scene was found booby-trapped after the shooting, police said. That car burned as the Covina bomb squad was trying to disconnect an explosive device in it, police said.



In an interview Saturday with CNN, Alvirez -- who represented Pardo's former girlfriend Elena Lucano in a child support case against Pardo -- said that Pardo and Lucano were in an "off-and-on again relationship" in 2001 and that Pardo was watching their 13-month-old son, Matthew, one Saturday while Lucano went grocery shopping.



When Lucano returned a short time later, she found Pardo frantically holding the unconscious toddler, Alvirez said.



"The child did get away from him for a few minutes and managed to crawl out of a patio door and slip into the pool," Alvirez said.



The couple rushed the child to a nearby hospital, where paramedics resuscitated him. Later, the gravely traumatized child was airlifted to Children's Hospital in Los Angeles, a world-renowned trauma center that specializes in severe pediatric care, for specialized treatment, Alvirez said.



During the first week in the intensive care unit, Pardo never left his son's bedside, Alvirez said. But a few weeks after the child was stabilized, doctors concluded that severe brain damage would confine him to a wheelchair for life, Alvirez said.



Less than six months later, Pardo and Lucano ended their relationship, and Pardo stopped visiting his son. Pardo also neglected to contribute to Matthew's medical costs, which surged up to $340,000 within the first year, Alvirez said.



"We had to sue [Pardo] on his $100,000 homeowner's insurance policy, and I recommended that Elena sue Bruce beyond the policy," he said. "She was not a vindictive type, and she knew he was living with overwhelming guilt and
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