A fatal workplace accident occurred at Sewickley Wastewater Treatment Plant leaving one plant employee killed and four more injured after they tried to help their fellow co-worker.

The cause of the accident is unknown, but it is thought a gas of some kind was the reason for the tragic accident. According to officials, the man was working in a 30-foot hole when he attempted to climb out, but fell backward into the hole.

He then radioed in that he was feeling faint and workers responded to the call. Three more employees were faint after inhaling the unknown fumes. All four people were rushed to the hospital and three were treated and released while the other was pronounced dead.

Workplace accidents can change the lives of all people involved, our thoughts are with the friends and family of the victim.