Abstract: At 12:30 p.m. on July 21, 1991, Employee #1 was felling an oak tree that was approximately 12 in. in diameter. When the tree fell, it landed on a standing leaner, which raised and swung; its butt struck and pinned Employee #1, killing him. The investigators have determined that the accident had several contributing factors: (1) the terrain was steep; (2) the escape path was not properly cleared; (3) Employee #1 did not move away from the stump until the tree was in full motion; (4) the undercut left a kerf dutchman that altered the direction of the fall; (5) Employee #1 did not properly observe the factors and plan the felling of this tree.