PARKERSBURG, Iowa -- A high school coach who helped launch several professional football careers was gunned down by a former player Wednesday morning in front of students taking part in an offseason workout, authorities said.

Hundreds of mourners later prayed and embraced at a vigil at a stadium in rural Iowa. Former players, neighbors and residents from nearby towns held candles as they listened to Biblical passages in honor of the deeply religious husband and father.

Mark Becker, who was supposed to have been taken to a hospital psychiatric ward after allegedly leading police on a high-speed chase Saturday night, unloaded several rounds into Aplington-Parkersburg High School football coach Ed Thomas and was arrested at a nearby home soon afterward, said Kevin Winker, assistant director of the Iowa Division of Criminal Investigation.

Winker said he couldn't discuss what Becker's motive for the slaying might have been, or what Becker might have been up to in the days leading up to the shooting.

"Motive is one of those things we're looking into," Winker said.

School was not in session, and Becker did not threaten any of the students in the room, he said.

Thomas, 58, died at a Waterloo hospital. His shooting stunned the rural community of 1,800 residents 80 miles (128 kilometers) northeast of Des Moines, and it reverberated through NFL circles, where he was remembered as much for his faith as his winning record.

"Coach Thomas was very special to me and many other young men from the Aplington-Parkersburg communities," said Green Bay Packers linebacker Aaron Kampman. "His legacy for many will be associated with his tremendous success as a football coach. However, I believe his greatest legacy comes not in how many football games he won or lost but in the fact that he was a committed follower of Jesus Christ."

Named the NFL's 2005 high school coach of the year, Thomas amassed a 292-84 record in 37 seasons as a head coach - 34 of them at Aplington-Parkersburg. He coached several players who went on to the NFL, including Kampman, Jacksonville Jaguars center Brad Meester, Detroit Lions defensive end Jared DeVries, and Denver Broncos center Casey Wiegmann.

Meester said he revered him almost as a father figure, and that his high school coach was able to get the most out of each of his players.

"He's one of those guys that truly cared about every player that was in that program," Meester said in a statement.

"It's just the stuff that he taught every one of us, stuff that I'll never forget. The value of hard work, pride in what you do and just caring about the guy beside you and that's what he did. He cared for each and every one of us that went through that program," he said.

Becker, 24, is charged with first-degree murder and was being held in Butler County jail. The sheriff's office said Becker did not have an attorney, and he was not scheduled for arraignment Wednesday.

Phone messages seeking comment from family members of Becker and Thomas were not immediately returned.

According to court records, Becker threatened a Cedar Falls homeowner with a baseball bat Saturday night, smashed windows at the home and rammed his car through its garage door before leading police on a high-speed chase.

Cedar Falls Police Chief Jeff Olson said Wednesday that Butler County deputies arrested Becker after a chase through Grundy and Butler counties. Deputies agreed to take him to a hospital psychiatric ward and request that Cedar Falls police be notified when he could be released. Cedar Falls police didn't hear anything more, but on Tuesday, Becker was released from custody.

It wasn't immediately clear if Becker was taken to the ward. The Sheriff's Office declined to comment on the matter.

Phone messages left with the homeowner, Dwight Rogers, were not immediately returned.

Gov. Chet Culver, who was once a high school teacher and coach in Des Moines, said he was stunned by the shooting.

"As a former high school football coach, I've always had great admiration and respect for Coach Thomas," Culver said in a statement. "The state and national coaching fraternity has suffered a devastating loss. As we mourn the passing of Coach Thomas, it is my hope we can all continue to learn from his example."

DeVries, a defensive end with the Lions, walked off the practice field in Allen Park, Michigan, toward the end of the team's morning practice. He looked shaken after being informed Thomas died. (AP)