A longtime Army civilian at Aberdeen Proving Ground died after a "grass cutting incident" at work on Tuesday, officials said.
Willie Stevenson, 61, was severely injured while he was riding a lawn mower near the Route 24 Gate on the Edgewood side of the Army post, spokesman Kelly Luster said. He did not describe what happened.
Emergency personnel were called to the scene at about 9:15 a.m., Luster said. Stevenson was taken by helicopter to the Maryland Shock Trauma Center, where medical personnel were unable to save his life.
"Everyone at Team APG is extremely saddened at the loss of one of our own," Col. Gregory McClinton, the post commander, said in a statement. "Willie was part of our family and will be sadly missed.
McClinton ordered an immediate "safety stand down," to allow workers to review operating procedures and processes and discuss best practices.
Stevenson worked at Aberdeen Proving Ground for nearly 25 years, Luster said. Before that, he served in the Army for about 10 years.
The Army is investigating the cause of the incident.