Authorities are investigating whether the killing of a Texas county prosecutor earlier this year is linked to the slaying of Colorado's prison director.

Kaufman police chief Chris Aulbaugh said Friday the FBI is checking to see if the January shooting death of Kaufman County Assistant District Attorney Mark Hasse is connected to Tuesday's killing of prison chief Tom Clements.

Hasse was killed about 100 miles away from where former Colorado inmate and white supremacist Evan Spencer Ebel died Thursday after a shootout with deputies. Investigators are trying to determine if Ebel is linked to Clements' death.

Aulbaugh calls the investigation routine for attacks that appear similar. Both targeted law enforcement officials. Authorities have investigated whether Hasse's death could be linked to a white supremacist gang.