It took less than an hour for an Erath County jury to find the former owner of BQuick Brazilian Jiu Jitsu guilty of sexually assaulting a student who was 14 years old at the time.

Jurors were still assessing punishment for Samuel David Lewis, 25, Wednesday afternoon.

He was arrested in January 2014 and charged with sexual assault of a child, a second degree felony.

The victim, now 17, told jurors Wednesday that she began training with Lewis in the summer of 2013. She said Lewis told her he was unhappy in his marriage.

"I being the emotional teenager, came to feel bad for him," she said. "I felt bad and was sympathetic towards him."

She said the two communicated through text messages and Facebook, and that the relationship turned sexual on Christmas Eve 2013 when they had sex in the bathroom inside the gym.

The victim's mother learned about the relationship after finding Facebook exchanges and after confronting her about their relationship, went to police.

The victim testified that Lewis knew she was a high school freshman at the time.

Testimony concluded with Lewis’ ex-wife taking the stand.

His ex-wife said she became suspicious of the relationship between Lewis and the victim after the amount of time they started spending together and when he began text messaging her late at night.

“The main incident that got me upset was Christmas Eve,” she said.

Lewis told her he needed to train the victim and her brother because of an upcoming competition. She later found out the victim’s brother was not with them.

At the beginning of January, she went to the victim’s mother with her concern.

“I told her I thought something was going on that was further than a student/coach relationship,” she testified.

That’s when the victim’s mother went to police.

Lewis attempted suicide shortly after his arrest and while he was in recovery, his ex-wife said he acknowledged the incident one time.

“I wanted to know why. Was it because she was pretty? Was it because she was young? Was it because she did Jiu Jitsu? Because I thought I was a pretty good wife,” she said. “He said it was because of Jiu Jitsu and that was the only time he mentioned it at all.”

District Attorney Alan Nash and Andrew Ottoway, Lewis' defense attorney, then went into closing arguments.

“When men don’t uphold those boundaries with young ladies, it’s up to us to enforce those boundaries,” Nash said. “One of the last things (the victim) talks about (in a text message) is, ‘I just got grounded, I got my phone taken away.’ Is that not a giant neon warning sign to a 23-year-old?”