A stepfather and mother are arrested and accused of repeatedly raping their 15-year-old daughter, starting when she was 12, according to court records.Kevin Carothers, 35, was arrested last week and charged Tuesday with sexual assault on a child by a person in a position of trust and aggravated incest, both felonies, said Denver district attorney spokeswoman Lynn Kimbrough.The girl's mother, Theresa Carothers, 37, had been a fugitive since last week but was arrested in Lakewood on Wednesday afternoon, Kimbrough said. She was being taken to the Jefferson County Jail.The investigation began in May after the girl told a legal guardian that Kevin and Theresa Carothers started raping her in the summer of 2009 and that it continued to December 2011, according to an arrest affidavit. Denver Social Services alerted Denver police of the sex assault report.Kevin and Theresa Carothers were married in December 2006, according to the woman's Facebook page.Their daughter told an investigator that Kevin Carothers began groping her in the basement of their Denver home in October 2009 when she was 12 years old, the affidavit said, and he told her not to tell anyone.Soon, the stepfather was raping the child, the affidavit said.By December 2009, the family had moved to live with Kevin Carothers' parents on South Raleigh Street in Denver. The girl was taking classes online, instead of attending regular school, the affidavit said.It was at this time, the girl told an investigator, that her mother joined her stepfather in sexually assaulting her, the affidavit said.The girl recalled an incident when she and her mother were watching movies in a bedroom, the affidavit said.Kevin Carothers came home from work and started touching the girl while she was on a bed, and then her mother began touching the girl, the affidavit said.The girl described how her mother would take nude photos of her when she was 13 or 14 and send the images to Kevin Carothers, the affidavit said.The nude photos soon got the parents into trouble, according to police.The family was kicked out of the home of Kevin Carothers' parents in December 2011 after his mother found the nude photos of her granddaughter on a camera and confronted the child's parents, the affidavit said.The girl told an investigator Kevin and Theresa Carothers then deleted the photos from the camera.According to the affidavit, a female described only as a "witness" told investigators that once, while the witness was driving, she saw Kevin Carothers touching his stepdaughter's genitalia as the two sat in the back seat of the car. The witness also said that on Theresa Carothers' cellphone, she found sexually explicit text messages the mother was exchanging with Kevin Carothers.The witness told investigators that Kevin Carothers also molested her, groping her breasts and grabbing her buttocks "all the time," the affidavit said. He also pulled at the front of her shorts so he could look down them.The witness told investigators she would push his hands away and tell him to stop, but he kept groping her.Kevin Carothers was arrested Friday and remains in the Denver Detention Center on $100,000 bond.This isn't the first time Kevin Carothers has gotten trouble with the law.In December 1996, Kevin Carothers was charged with sexually assault on a child, according to court records.He pleaded guilty in May 1997 to the lesser charge of felony attempted sexual assault on a child and was sentenced to three years in Colorado prison, court records said. The sentence included four years of intensive supervised probation.According to his arrest affidavit, Carothers is a registered sex offender, but his name does not appear on the Colorado Bureau of Investigator's Sex Offender Registry website.CBI spokeswoman Susan Medina said Wednesday it appeared Carothers had unregistered as a Colorado sex offender in April after he told CBI he was moving to another state. CBI officials are reviewing what happened with his registration status.Carothers' plans to move occurred just before May, when Denver Social Services reported the sexual assault allegations to police.In April, Denver police checked to see if Carothers was still living where he was registered as a sex offender, at his parents' South Raleigh Street home, Kimbrough said. Police found that Carothers had moved out -- or, as the affidavit notes, he was kicked out four months earlier by his parents over the nude photos of his stepdaughter.Denver officers tracked him down to Aurora and told Carothers that he had to registered as a sex offender with Aurora police.Aurora police spokesman Officer Frank Fania said Carothers registered with his agency on April 19, but he told police he did not have a permanent address. Fania said sex offenders are classified as "lack of fixed address" when they lack a permanent residence.When Aurora police learned that Denver police had arrested Carothers on Aug. 17 in the sex assault case, Fania said his agency "de-registered" Carothers as a sex offender in that city.