UPDATED at 12:15 p.m. with mug shot of suspect.

ST. LOUIS COUNTY • A passer-by who tackled a man who was trying to flee after scuffling with a Missouri Highway Patrol trooper says he's no hero.

"I felt it was like something that everyone should do," Doug Beis said Monday of his good Samaritan turn over the weekend.

The Missouri Highway Patrol said Beis came to the trooper's aid after a suspected drunken driver struggled with a trooper and tried to run.

The officer sustained minor injuries to his hands and one knee due to a fall during the struggle, a Highway Patrol spokesman said. He was treated Mercy Hospital St. Louis (formerly St. John's Mercy Medical Center) and released. 

The man Beis helped catch, Jason M. Becks, 44, of Ste. Genevieve, Mo., faces charges of assault on the officer, resisting arrest, drunk driving and driving on a revoked license. He was being held on $100,000 bail in the St. Louis County Jail in Clayton.

Beis, 44 and a registered nurse at St. Anthony's Medical Center, said he was driving home from work about 7 p.m. on Saturday when he saw flashing police lights on Interstate 55 near Meramec Bottom Road.

"As I was driving by, I saw the officer and a gentleman that he had pulled over struggling," the married father of two said.

Beis said all he could think about at that moment was that the man was going to hurt the officer and he couldn't let that happen. He pulled over and ran toward the patrol car, he said.

The officer was on the ground, Beis said, and the man police have identified as Becks had jumped over a guardrail and was running in Beis' general direction.

"I told him to get on the ground," he said. "He didn't say a word to me. We communicated with our eyes. He looked at me like, ‘I'm coming through you,' and I was looking at him like, ‘No, you are not.' He came right at me and I tackled him to the ground."

They struggled and Beis ended up on top of the man, who was face down. Another motorist stopped and they helped the injured officer put handcuffs on the man.

"He sat down in the grass next to us," he said. "He was exhausted. Fighting a man will take a lot out of you."

Beis said his job is helping people and that's all he thought about. He said he's not a hero.

"I think that term should be reserved for soldiers, police officers and firefighters," Beis said. "You can call me a concerned citizen or you can call me a good Samaritan, but (hero) is an honor reserved for them."