A neighbor found Charles Johnson, 60, of Omaha, dead at 8:11 p.m. Friday and called the county's 911 center, said Howard County Sheriff Harold Schenck.

Johnson had been cutting firewood on property he owned at 504 Highway 22, which is south of Wolbach just across the Howard County line, Schenck said.

Autopsy results, which became available Monday, confirmed that Johnson died of a heart attack, Schenck said.