An Ottumwa man was killed over the weekend in a one car crash in Van Buren County.  The Iowa State Patrol says 55-year-old Michael Dewayne Lawson was going north on County Road V56 around 11:30 Friday night (7/26) when he ran the stop sign at County Road J40, went into the north ditch on J40 and hit the embankment.  Lawson was pronounced dead at the scene.