DAVIS (CBS13) — Court documents reveal a teenage double-murder suspect has a history of mental illness.

Daniel Marsh, 16, is facing first-degree murder charges in the brutal deaths of elderly couple Chip Northup and Claudia Maupin. The two were found stabbed to death in their Davis home.

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Charges against Marsh also include enhancements for lying in wait, torture and depravity.

While a motive may never be known, CBS13 obtained court documents that show a list of the suspect’s apparent mental issues.

The details are part of family court documents as Marsh’s parents battled each other recently in a bitter divorce and custody fight.

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In one filing, Daniel Marsh’s father, William, tells a judge his son was reviewed and found to be severely depressed and anorexic. The filings go on to state he would spend six weeks in a Berkeley hospital.

But things apparently got worse.

His mother disclosed to the judge that, just four months before the April murders, Daniel agreed to a voluntary psychiatric hospitalization in Sacramento for two weeks, stating he was self-medicating with alcohol, among other problems.

Attorney Kevin Adamson says depending on the evidence, there could be an insanity defense.

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“There would be experts called at the trial to give expert opinions as to whether he knew right or wrong at the time of the crime,” he said.