A former

lightweight title contender has been sentenced to more than three years in prison after being convicted this week of sexually abusing an underage female student at his Clackamas martial arts school.

Hermes Franca Barros, 37, pleaded guilty in Clackamas County Court on Wednesday to one count of unlawful penetration and one count of first-degree sexual abuse. He was sentenced to 3½ years in prison.

He was

. The remaining counts were dismissed.

Barros will also have four and a half years of post-prison supervision and must register as a sex offender.

Barros, a resident of Jupiter, Fla., turned himself in to Clackamas County Sheriff's Deputies in May after a warrant was issued for his arrest, stemming from a December 2010 encounter with one of his students.

Barros operated the Team Hermes Franca Brazilian Jiu-Jutsu Academy. He has a

as a professional mixed martial artist and

.

He unsuccessfully challenged for the promotion's lightweight title in 2007. After the bout he was suspended from competition for a year and fined $2,500 by the

for testing positive for a banned steroid in his post-fight drug test. He last fought in April, losing by knockout in the second round during a fight in Brazil.

Last June, Barros apparently

reflecting that he immigrated from Brazil to the U.S. in 2000 with $300 and speaking very little English but eventually "lost sight of what is truly important (in) life."

"Drinking, women, parties, all part of a lifestyle that has led to my failing as a husband, a father, a dreamer," he wrote. "I am now a man with very little freedom."

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