EXCLUSIVE

Steven Avery claims his own two brothers may have killed Teresa Halbach -- especially one who he says had a history of harassing women at the exact location where Teresa was last seen.

Avery filed legal docs -- obtained by TMZ -- in which he claims brothers Earl and Charles may have done the deed for which he's serving a life sentence. He says both have a history of sexually assaulting women. Earl once pled no contest to sexually assaulting his 2 daughters.

According to the docs, which Steven filed in 2009 after his conviction, brother Charles' criminal conduct and actions are even more problematic. He was charged with sexually assaulting his wife by holding her down and trying to strangle her with a phone cord before having intercourse with her.

The docs say Charles also had a history of aggression toward women who visited the family's junkyard. One woman, who was there to retrieve her car that had been towed, complained to cops she was afraid of Charles because he was aggressively pursuing her ... sending flowers and money to her home, calling her incessantly and showing up at her doorstep.

According to docs there was another incident in which a woman who bought a car part from the junkyard was harassed by Charles, who asked her on dates and showed up at her house.

Another woman claimed Charles had repeatedly driven by her house and would tell her on the phone he had seen her in her bathing suit as he drove by.

And this is interesting ... according to the docs, all of these women were allegedly harassed by Charles within a month of the time Teresa Halbach went missing.