The Boulder County Sheriff's Office announced there will not be any charges pressed against the driver in an accident that injured Boulder triathlete Richie Cunningham, saying an investigation revealed the driver stopped to avoid another car and not because of road rage, according to officials.

But Cunningham said he still maintains that the driver -- Shepherd Wolfe -- was not trying to avoid another car and was acting out of anger.

"There was a car in front of him but it wasn't close," Cunningham said. "The driver was just using that as an excuse, as his way out of getting charged."

According to investigators, Cunningham and three other professional triathletes -- Ben Hoffman, Patrick Evoe and Joe Gambles -- were riding north in the 15400 block of 83rd Street Thursday on July 4 at around 9 a.m.

As the riders approached a downhill turn, a truck driven by Wolfe, 46, of Fort Collins, passed the cyclists while honking. Cunningham and the cyclists then said Wolfe stopped his truck in front of them, causing Cunningham to brake and flip over his handlebars.

Cunningham -- who suffered injuries to his elbow, shoulder and back -- told investigators he thought Wolf stopped out of road rage.

But Wolfe told investigators he honked at the cyclists to let them know he was passing them, according to a release from the sheriff's office. After passing them, Wolfe and another driver in the area told investigators Wolf was forced to make an abrupt stop to avoid hitting a car in front of him as he came down the hill.

Wolfe also told investigators he saw Cunningham crash behind him but saw the other cyclists helping him and did not know he was injured.

Wolfe did not immediately return calls for comment Monday morning.

After going over the facts with members of the Boulder County District Attorney's Office, investigators decided no charges would be pressed.

Cunningham said he was disappointed when he was notified of the decision by detectives.

"I was pretty angry at the time, and I feel a little let down that that was the conclusion especially when I know exactly how that went down and what the driver's intentions were," Cunningham said. "I was a little shocked by the decision."

Cunningham also said he wasn't sure why Wolfe wasn't at least charged with leaving the scene of an accident.

"Maybe it was hard for them to win in court, I don't know, but it's pretty disappointing for cyclists," Cunningham said. "It's a bit frustrating, we have no rights on the road except when we do something wrong. When it comes to the opposite and we need to be protected we basically don't get anything.

Cunningham said he still has no doubt in his mind that the accident was a case of road rage, and he said he's concerned about Wolfe.

"There is no other reason for (the accident)," Cunningham said. "It's not a matter of if he does it again, it's a matter of when. He's one of those people, he's going to do it again, and it will be on police's hands when he kills someone."

In the meantime, Cunningham said he is considering a civil lawsuit now that there will be no charges filed.

"It wasn't part of what I wanted to do," he said. "I wanted it to be handled in the legal system and I would be happy with that, but now I may chase my own avenues."