BOLIVAR PENINSULA, Texas -

An arrest has been made in connection with the double murder mystery on the Bolivar Peninsula.

The Galveston County Sheriff's Office says they have arrested James Larry Cosby, 46, who is the father of one of the victims, Britney Cosby.

James Cosby is charged with two counts of tampering with evidence in connection with the death of his daughter and her friend, Crystal Jackson.

Cosby's criminal rapsheet shows he has been convicted of sexual assault, assault and bodily injury, unlawfully carrying of a weapon and failing to register as a sex offender.

Deputies tell Local 2 that investigators were at James Cosby's home Wednesday night collecting evidence, which led them to believe that his house was a secondary crime scene.

Cosby is currently being held in the Galveston County Jail on a $500,000 total bond.

Deputies say the investigation is still ongoing, which may lead to charges being upgraded to capital murder.

The bodies of Jackson and Britney Cosby, both 24, were found near a convenience store dumpster last Friday morning. Investigators say both women had been murdered about eight hours earlier.

A sketch of a suspect was released after a witness told investigators a man was a seen driving Britney's 2006 Kia Sorrento. Both Jackson and Cosby were allegedly seen inside the car with the man at the time.

That was the last time the two women were seen alive. The SUV with temporary plates hasn't been seen since. According to investigators, whoever killed the women, also took their wallets and IDs.

Deputies are still searching for the victim's vehicle.

Crystal was shot to death and Britney died from blunt force trauma.

For days, family members have been mourning the brutal murders of the two women. They say they are stunned by James Larry Cosby's arrest.

Anyone with information is asked to please contact the Sheriff's Office TIPLINE at 866-248-8477 or Galveston County Crime Stoppers at 409-763-8477.