James Holmes -- the shooter in the Aurora movie theater massacre -- was hospitalized after several "half-hearted" suicide attempts ... this according to law enforcement.
According to cops, Holmes ran headfirst into a jail cell wall on Tuesday ... and while he sustained injuries ... they were not life-threatening.
Holmes also reportedly stood on the bed in his cell and fell backwards ... in an apparent attempt to crack his skull open. He failed.
Holmes -- who killed 12 people and injured 58 more during his July 20 shooting rampage -- has since been released from the hospital.
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