Fugitive may think girls are his

In this photo made from surveillance video and released by the Tennessee Bureau of Investigation, Adam Mayes, 35, stands in front of the counter at a convenience store on April 30, 2012 in Union County, Miss., about three days after Jo Ann Bain and her daughters disappeared. Authorities say Mayes abducted Bain and her three daughters. Bain and her oldest daughter were found dead. The two younger girls are still missing.

GUNTOWN, Miss. — A Mississippi man killed a Tennessee mother and her teenage daughter so he could abduct two young sisters who are still missing, according to court documents filed Wednesday, and a relative said the suspect thought the two younger girls might be his daughters.

The developments gave the first hint of a motive in the case that began in southwest Tennessee, stretched into Mississippi and led the FBI to put 35-year-old Adam Christopher Mayes on its 10 Most Wanted list. Authorities said they think the missing girls, 12-year-old Alexandria and 8-year-old Kyliyah Bain, are still with Mayes nearly two weeks after he took them.

Mayes’ mother-in-law said he thought he might be the girls’ father and it caused trouble in the marriage to her daughter, who’s jailed in the case.

“She was tired of him doting on those two little girls that he claimed were his,” Josie Tate said in an exclusive phone interview with The Associated Press on Wednesday.

In an earlier interview, Tate’s daughter Bobbi Booth said Teresa Mayes suspected her husband was having an affair with Jo Ann Bain.

Authorities refused to comment on the motive for the April 27 slayings and abductions at a Wednesday news conference.

Mayes and his wife, Teresa, were charged in Bolivar, Tenn., on Wednesday with first-degree murder in the deaths of Jo Ann Bain and 14-year-old Adrienne Bain. Their bodies were found buried outside the Mayes’ home near Guntown, Miss., a week after they were reported missing by Jo Ann Bain’s husband, Gary.

Teresa Mayes told investigators she saw her husband kill the two in the garage at the Bain home near Whiteville, Tenn., and then she drove him, the younger girls and the bodies to Mississippi, affidavits filed in court say.

The mother and older girl were killed so Mayes could take the younger sisters, the affidavit said.

Federal authorities pleaded for the public’s help in finding the sisters and urged Mayes to surrender.

“Turn the girls in, and then peaceably and safely turn yourself in to law enforcement,” FBI Special Agent Aaron Ford said at the news conference.

Officials said the reward for information “leading directly to the arrest” of Mayes is now $175,000.

Since the manhunt began for Mayes, people who knew him and the Bains have described him as unusually close to the family and the girls. He was described as a friend of Gary Bain, and the children considered him an uncle.

He was often at the Bain home. Authorities said he was spending the night there before the mother and daughters disappeared so he could help the family to pack for a planned move to Tucson, Ariz., and then drive their belongings west.

Authorities said Alexandria has brown hair and hazel eyes and is 5 feet tall and 105 pounds. Kyliyah has blonde hair and brown eyes and is 4 feet tall and 57 pounds.