LOS ANGELES (CBSLA.com) Leo Liu hoped that enrolling in a clinical trial for an anti-psychotic drug in 2009 would help his schizophrenia.

But just three days after receiving his first injection of the drug made by Janssen Pharmaceuticals, a unit of Johnson & Johnson, Liu died.

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His mother, Marion Liu, has been suffering ever since.

On Oct. 16, a jury rule in her favor in a negligence lawsuit — awarding her $5.6 million.

“When you lose a child, it’s like a part of you is being ripped out,” Liu said.

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The settlement has done little to stop Liu from questioning the series of events that led to her son’s death.

For one, Leo’s doctor had him sign a 22-page consent form — something his mother says he was not in a position to do with a clear mind.

What’s more, Janssen’s internal screening — taken just a week before Leo’s death — showed that he had an abnormal heart condition.

Yet another problem, Liu said, is that Leo’s doctor received thousands of dollars for enrolling patients in the drug trial.

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“They need to do some changes in how they go about recruiting these patients, especially those who are schizophrenic, bi-polar and mentally ill,” Liu said. “Don’t use them as guinea pigs.”