A North Texas county district attorney and his wife were found dead in their home on Saturday, two months after one of his assistant district attorneys was shot to death in a parking lot a block from his office.
Police, FBI agents, Texas Rangers and Kaufman County sheriff's deputies were investigating the deaths of county district attorney Mike McLelland and his wife Cynthia, sheriff's lieutenant Justin Lewis said late on Saturday.
Lewis said he couldn't discuss the investigation in further detail, including how the couple died and whether authorities believe their deaths are linked to the January 31 fatal shooting of Mark Hasse, an assistant Kaufman County district attorney.
The Dallas Morning News reported that police chief Chris Aulbaugh said the McLellands had been shot in their home and that although investigators didn't know if their deaths and Hasse's were related, they couldn't discount it.
"It is a shock," Aulbaugh said, according to the paper. "It was a shock with Mark Hasse, and now you can just imagine the double shock and until we know what happened, I really can't confirm that it's related but you always have to assume until it's proven otherwise."
Sam Rosander, who lives in the same unincorporated area of Kaufman County as the McLellands informed that sheriff's deputies were parked in the district attorney's driveway for about a month after Hasse was killed.
Aulbaugh said recently that the FBI was checking to see if Hasse's killing could be related to the March 19 killing of Colorado Department of Corrections head Tom Clements, who was gunned down after answering the doorbell at his home. He said it's routine for authorities to look for possible links when there are similarities between two deaths.
Evan Spencer Ebel, a former Colorado inmate and white supremacist who authorities believe killed Clements and a pizza deliveryman two days earlier, was killed in a March 21 shootout with Texas deputies about 160km from Kaufman.
Hasse was chief of the organised crime unit when he was an assistant prosecutor in Dallas County in the 1980s, and he handled similar cases in Kaufman County, 53kms southeast of Dallas.
McLelland had said Hasse was one of the 12 attorneys on his staff, all of whom handle hundreds of cases at a time.
"Anything anybody can think of, we're looking through," McLelland said after the assistant prosecutor was killed.
In recent years, Hasse played major roles in Kaufman County's most high-profile cases, including one in which a justice of the peace was convicted on theft and burglary charges and another in which a man was convicted of killing his former girlfriend and her 10-year-old daughter.
McClelland graduated from the University of Texas before a 23-year career in the Army, according to the website for the district attorney's office. He later earned his law degree from the Texas Wesleyan School of Law.
He and his wife have two daughters and three sons. One son is a police officer in Dallas.