The Harrs County Sheriff's Office said they caught the suspect who killed a deputy in a Houston suburb.

Deputy Darren Goforth, 47, was pumping gas about 8:30 p.m. Friday when a man approached him from behind and fired multiple shots, Harris County Sheriff's Office spokesman Ryan Sullivan told The Associated Press.

The sheriff identified the man as Shannon J. Miles, 30. Sheriff Ron Hickman said Miles had a criminal record for resisting arrest and trespassing. They are not sure of the motive yet.

Goforth was a 10-year veteran of the force, had a wife and two children, according to Harris County Sheriff Ron Hickman.

"In my 45 years in law enforcement, I can't recall another incident so cold-blooded and cowardly," Hickman said, who added no motive had been determined.

An impromptu memorial had begun Saturday morning at the Chevron station pump that Goforth was using on Friday night, a pile of balloons, flowers, candles and notes, including one that said, "Gone but never forgotten R.I.P. Deputy Goforth." The gas station was open, but that pump was closed.

Brian McCullar knew Goforth because the deputy had patrolled his neighborhood, which is about two miles from the gas station, and spoke often.

"He was passionate about what he did," the 49-year-old said, adding, "We're still in shock. ... It's a huge loss for his family. It's a huge loss for this area.

"You're talking about a guy that made a difference."

Goforth had traveled to the Chevron station after responding to a routine car accident, Gilliland said.

"He was pumping gas into his vehicle and the male suspect came up behind him and shot the deputy multiple times," Gilliland told the Houston Chronicle. "The deputy fell to ground. The suspect came over and shot the deputy again multiple times as he lay on the ground."

Harris County Sheriff's deputies and homicide investigators joined officers from other agencies, including the Texas Department of Public Safety and the Houston Police Department, in the search.

"This is a very tough moment right now for the Harris County Sheriff's Office," Gilliland said. "Keep us in your prayers and in your thoughts."

Bob Goerlitz, president of the Harris County Deputies Organization, said the incident was "shocking."

"We've been warned of things like this, because of public sentiment nationally and events over the last few years ... It's just horrific. That's the only way to describe it."