The 44-year-old was released from the Kent County Jail in MI on Thursday and picked up by U.S. Prisoner Transportation Services to be extradited to Texas, she told reporters.
Authorities are investigating how he managed to get free.
Marks has three pending murder charges against him, authorities said, adding that he is considered to be "extremely unsafe".
Authorities say he escaped while being transferred to Bell County to face that charge.
Of note is the mention of murder charges, which is the first official indication that Marks may be a suspect in the deaths of Scott and Swearingin.
Residents in the area have been advised to stay indoors during the manhunt.
Marks was extradited from Kent County, Michigan on January 31 for a burglary charge in Temple, where he allegedly broke into Jenna Scott's home.
Temple police said Scott filed a protective order against Marks in July 2018, months before she went missing. 264th District Court Judge Paul LePak in Bell County denied her request. She remains in the Bell County Jail with bond set at $500,000. 26-year-old Maya Renee Maxwell was also arrested, charged with evidence tampering after police say she left Swearingin's vehicle in Austin in hopes of concealing it from police.
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Maxwell had been in the Muskegon County Jail in MI since her January 11 arrest.
Maya Maxwell, 26, was arrested and charged after she told police that she tried to hide Swearingin's auto in the Austin area after his disappearance.
April Pease, the mother of Marks' son, disappeared on March 17, 2009, the local newspaper reported.
Additional details were not immediately available. The Washington state woman had accused him of domestic violence.
Pease's mother, Dottie Pease, told KCEN last month that she had believed her daughter might have had a drug relapse, but that given the developments in Texas, she thought it was possible that Marks might have had something to do with her daughter's disappearance.
The search for Marks drew a massive law enforcement presence north of Houston, with part of Interstate 45 being shut down during the manhunt.
"As more information comes in, we will follow up", Hartley told the FME News Service.