Here's a reminder why running at a crowded tourist site could be dangerous, even deadly.

A Chinese woman died after suffering a major head injury after being pushed into the Great Wall of China by a Canadian tourist.

Cui Hongfang, a 73-year-old woman visiting from northeastern China, was visiting the historic site with family members last Wednesday when she collided with a Canadian woman. The impact forced Hongfang’s head into a corner of the stone wall, according to the South China Morning Post.

Though the incident has been ruled an accident by local police, authorities are still investigating the circumstances surrounding the elderly woman’s death. Hongfang’s husband told The Beijing News that his late wife was knocked over because the Canadian tourist was running down a particularly step section of the Great Wall.

“The foreigner was moving really fast. She was chasing [someone] and laughing and wanted to go between me and my wife,” he said.

According to the family, Hongfang immediately lost consciousness after colliding the Canadian tourist and began bleeding from her mouth, nose and ears. But it still took a medical team nearly an hour to arrive at the site due to the remote location of the incident.

The collision occurred just outside the range of CCTV cameras so is there no footage of the accident.

"It happened right in one of the security camera system's blind spots," an official of the Mutianyu Great Wall Tourism Services Company told news website China.org.cn.

"We have rules and warnings for tourists, asking them not to chase each other, run fast or play around on the steep sections of the Great Wall."

After interviewing the Canadian tourist, whose last name has been identified as Fortin, and several witness, Chinese police decided not to press charges.

However, Hongfang’s family has been advised to file a civil suit to seek compensation from the tourist, who has since returned to North America.