Orlando Brown Mentally Unfit for Trial?

Back in December former Disney child star Orlando Brown was arrested in Ohio after trying to attack a family member with a knife and hammer [click here if you missed that]. 

Now it looks like Orlando may be preparing to plead insanity...

From TMZ

According to legal docs obtained by TMZ, Brown's attorney is asking for a mental evaluation to see if the disgraced actor is mentally fit for trial.

Orlando's charged with aggravated menacing, a first-degree misdemeanor in Ohio, for his December arrest. The former Disney star previously pled not guilty, but the results of the evaluation could lead to Orlando changing that plea to not guilty by reason of insanity.

In the meantime, Orlando's on house arrest ... he was released from custody Friday after posting bond of about $25,000.