Cedric Marks escaped from the private prison transport van during a stop for food at a McDonald's in Conroe, Texas, Police Lieutenant Dorcy McGinnis said during a news conference in the city, which is about 65 kilometres north of Houston. Their bodies were discovered 12 days later buried on rural property in Oklahoma.
Temple police said Scott filed a protective order against Marks in July 2018, months before she went missing.
Two women were arrested in MI on charges related to Marks.
An MMA fighter suspected of killing an ex-girlfriend and friend of hers escaped on Sunday (Monday NZT) from a prisoner transport van, U.S. authorities said. He has not been charged in the deaths of Scott and Swearingin, who were reported missing from Temple on January 4.
Marks fights under the moniker "Spider-Man" but hasn't stepped into the ring since last March, according to the MMA site Sherdog.
Law enforcement could be seen sprinting down a highway access road and swarming a Conroe Walmart.
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The private agency picked up Marks at a MI jail on Thursday to take him back to Texas, where he had been extradited, KWKT reported.
Marks was recaptured by law enforcement Sunday afternoon. KCEN-TV said Maxwell is accused of taking Swearingin's vehicle to Austin in an attempt to hide it.
Texas Prisoner Transport Services has contracts with several Central Texas departments, including Bell County, McLennan County and Hill County. The Houston Chronicle reported one victim is Marks' former girlfriend, who met him on Tinder and had a restraining order against him.
Marks is also a person of interest in the 2009 disappearance of April Pease, a Washington state woman who had a child with Marks.
Maxwell had been in the Muskegon County Jail in MI since her January 11 arrest. She yelled for her daughter to call 911, and he told her to make her daughter hang up the phone.
Hartley said Marks' and Pease's son was placed into protective custody in 2009 and he doesn't know the son's current location.