An off-duty police officer from Abilene, Texas, was killed on Aug. 31, making him the second officer killed in the state within a few days.
Don Allen, 27, was found dead in his home, with investigators describing his death as "clearly suspicious," CNN reported.
"The circumstances behind his death indicate that the probable cause is homicide," police Chief Stan Standridge said. "Aside from that, I'm not going to comment any further … I don't want to say anything today that would compromise our ability to hold these people accountable."
Authorities are pursuing numerous leads behind the shooting.
On Aug. 28, Harris County Deputy Sheriff Darren H. Goforth was shot while fueling his patrol car near Houston. Shannon J. Miles, 30, was charged with his murder.
"He runs up behind Deputy Goforth and puts the gun to the back of his head and shoots," Harris County District Attorney Devon Anderson said as he described surveillance video. "Deputy Goforth hits the ground and then he continues to unload his gun, shooting repeatedly into the back of Deputy Goforth."
The deaths have some believing law enforcement officers are being increasingly targeted, and while Standridge said there is no indication of that, he admits Allen's death has taken a toll on the community.
"The initial reaction was fear. Why was Officer Allen chosen?" he said. "That speaks volumes as it relates to how vulnerable are we ... We look like we're prepared for anything, but the reality is, we're just like you. We go to the same schools in this community. We attend the same churches. We eat at the same restaurants. We are just like you."
Nationwide, 23 law enforcement officers have been shot so far this year, the Officer Down Memorial Page tallied.
Traffic accidents are the most common cause of police deaths overall, according to the site.