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The FBI and law enforcement agencies in Utah and Wyoming are asking the public's help in obtaining "firsthand" information about two persons of interest in the slaying of Utah Transit Authority maintenance worker Kay Porter Ricks.

Authorities are specifically interested in the whereabouts of Utah father and son Flint Wayne Harrison, 51, and Dereck James "DJ" Harrison, 22, between May 10 and 14.

Ricks, 63, was found dead May 17 near a dirt road in the high desert south of Kemmerer, in Lincoln County, Wyo.

His UTA work truck was located two days later in the woods near Pinedale, Wyo., which is in neighboring Sublette County.

The Harrisons had been camping near Pinedale before their May 14 arrests.

The Harrisons ended up in Wyoming after allegedly kidnapping and assaulting a mother and her four daughters at a Centerville home May 10. The females escaped the home, and the Harrisons eluded a police manhunt and fled the state two days later, the same day that Ricks and his work truck disappeared.

FBI officials said they are particularly interested in tips from anyone who had contact with or saw the Harrisons between the May 10 kidnappings and when Ricks disappeared two days later.

"The more people we have filling in the timeline, the better," said special agent in charge Eric Barnhart. "... Nothing is unimportant."

Barnhart said officials have had a steady stream of information, but would like more help from the public.

He declined to discuss many of the details about the case during a Wednesday news conference, saying he did not want to influence the memories of any potential witnesses.

The Harrisons were extradited to Utah last week and on Monday made their first court appearances in the Centerville kidnapping case.

The motive for the abduction and assaults, Centerville police have said, appears to have been meth-fueled paranoia that the mother had informed police of their drug activities.

Police have not said how Ricks died, but have called it a homicide.

Anyone with information is asked to call the FBI at: 1-800-CALL-FBI (225-5324).