Assault complaint against Matt Brown back in front of prosecutor following 'private filing' in Ohio

They call Ultimate Fighting Championship (UFC) welterweight Matt Brown "The Immortal" -- but it's his assault complaint that won't die.

Not long after charges were dropped against the veteran mixed martial arts (MMA) fighter, his accuser and former Brazilian jiu-jitsu coach, Rodrigo Botti, obtained a "private filing" with the courts, which allows citizens the option of bypassing law enforcement in certain misdemeanor offenses.

"He was a coward when he attacked me and he is being even more of a coward trying to cover it up," Botti told MMA Junkie. "My position is wait on the justice, but we all know there is a lot of gaps in the system."

Brown calls the alleged assault, which supposedly took place back on Feb. 3, 2015 at the Ohio Combat Club in Columbus, Ohio, "a straight-up lie." The case has yet to be officially re-opened at this time, but is considered to be an "active, ongoing investigation," according to the report.

A decision of whether or not to move forward will likely be made in the coming weeks.

The former "Ultimate Fighter" was last seen dropping a unanimous decision against Johny Hendricks at the UFC 185 pay-per-view (PPV) event last weekend in Dallas, Texas, his second straight loss inside the Octagon.

For more on that fight click here.