As investigators search for leads in the case, authorities say a man called in a threat to a tip line, naming a county official as the next victim.
Authorities arrested Nick Morale, 56, on one charge of making a terroristic threat after he allegedly threatened a county official, Lt. Justin Lewis of the Kaufman County Sheriff's Office said Wednesday.
An arrest affidavit alleges that Morale called the county's Crime Stoppers tip line on Monday afternoon, saying that a county official "would be the next victim."
Lewis said there was "nothing to link" Morale to the slayings of McLelland, his wife or Hasse.
Morale was behind bars Wednesday with bond set at $1 million, Lewis said.
Authorities declined to release the name or position of the county official who was threatened.
'A trying time'
The district attorney's office in Kaufman County, which has about a dozen prosecutors, has kept a low profile since the killings. But it released a statement saying it, too, is trying to grapple with the killings.
"We would like to thank everyone for their thoughts and prayers for the family and co-workers of Mike and Cynthia McLelland; they, and the support that we have received in the last two days, are greatly appreciated," the statement read.
"This is certainly a trying time for all of us both professionally as an office, and personally as friends and co-workers of Mr. McLelland and his wife. Our thoughts and prayers go out to their families."
Kaufman County government offices will close Thursday to allow employees to attend a public memorial service in honor of the McLellands, Wood said. A funeral will follow on Friday.
Brandi Fernandez, McLelland's first assistant district attorney, has been named to lead the office on an interim basis. She will fill that role until the governor appoints a successor.
But whoever becomes Kaufman County's next top prosecutor will have to grapple with a haunting legacy, Kaufman city Mayor William Fortner said.
"I wonder if the governor is going to find anyone brave enough to take the job of district attorney."