A St. Louis plumber has died in a trench collapse. 43-year-old Clarence Allen was at the bottom of a hole eight to ten feet deep, and about four feet wide when it collapsed and covered him in several feet of dirt. Allen had been installing a sewer pipe in a backyard of a home north of Forest Park. A co-worker saw the dirt walls begin to give way and hollered at Allen, but Allen turned the wrong way and couldn’t escape.