McLelland, in an interview shortly after the Colorado slaying, raised the possibility that Hasse was gunned down by a white supremacist gang.
McLelland, elected DA in 2010, said that Hasse hadn't prosecuted any cases against white supremacists but that his office had handled several, and those gangs had a strong presence around Kaufman County, a mostly rural area dotted with subdivisions, with a population of about 104,000.
"We put some real dents in the Aryan Brotherhood around here in the past year," McLelland said.
McLelland said he carried a gun everywhere he went, even to walk his dog around town, a bedroom community for the Dallas area. He figured assassins were more likely to try to attack him outside. He said he had warned all his employees to be constantly on the alert.
"The people in my line of work are going to have to get better at it," he said of dealing with the danger, "because they're going to need it more in the future."
The number of attacks on prosecutors, judges and senior law enforcement officers in the U.S. has spiked in the past three years, according to Glenn McGovern, an investigator with the Santa Clara County, Calif., District Attorney's Office who tracks such cases.
For about a month after Hasse's slaying, sheriff's deputies were parked in the district attorney's driveway, said Sam Rosander, a McLelland neighbor.
The FBI and the Texas Rangers joined the investigation into the McLellands' deaths.
McLelland and his wife, Cynthia, 65, were the parents of two daughters and three sons. One son is a police officer in Dallas. The couple had moved into the home a few years ago, Rozell said.
"Real friendly, became part of our community quickly," Rozell said. "They were a really pleasant, happy couple."