Speculation about the Aryan Brotherhood of Texas
McLelland, in an interview with The Associated Press before his death, speculated that the Aryan Brotherhood of Texas could have been behind Hasse's slaying.
"We put some real dents in the Aryan Brotherhood around here in the past year," McLelland told the news agency.
McLelland said Hasse wasn't involved in the Aryan Brotherhood of Texas investigation, but his office was one of numerous Texas and federal agencies involved in an investigation that led to the indictment last year of 34 alleged members of the group -- including four of its senior leaders -- on racketeering charges.
Authorities have not said whether they have linked white supremacists to the deaths. But weeks after the indictment, the Texas Department of Public Safety said it had "credible information" the Aryan Brotherhood of Texas was planning to retaliate.
Asked about the group's possible involvement, the governor said it was too soon to link or discount the it.
"I think it's obviously too early to be speculating on whether there is any direct contact, but I think it's wise for us to not overlook any evidence that either may be superficial or otherwise," Perry said on Fox News.
"So they are here, they are active in this state. We know the drug cartels are very, very active in our country now," Perry said.