TULSA, Oklahoma - Witnesses were called to the stand Tuesday in the trial for a man accused of sexually assaulting several children in Tulsa County.

It was an emotional day of testimony as women who claim to have been sexually assaulted by Brian Campbell took the stand.

Campbell is charged with four counts of sexual abuse to a child under the age of 12.

The prosecution spent the bulk of the day outlining Campbell's past long before that.

Prosecutors said in opening statements that Campbell assaulted a 7-year-old relative when he was 13.

One woman told the court she was forced she was forced to perform oral sex on Campbell when he was 16 and she was only 12.

Campbell's stepdaughter, Crystal Toney, who is also a defendant in this case, testified she began a consensual relationship with Campbell when she was 17.

Another witness, Campbell's biological daughter, testified her father asked her to have sex with him when she was just 11 years old. 

She told the court her dad has three personalities. 

Brian, his normal personality, "daddy," his sexual personality and Romeo, which she calls his sexual, devious, "freak side."

The incidents in question happened between July 2014 and July 2016.

Testimony in this trial will continue Wednesday.