A jury found a rancher has no responsibility in the death of Jim Robinson, a meeker man who was poisoned in 1969.
A coroner found Robinson's death a homicide and says he was killed by thallium, a pesticide used in the 1960s.
Robinson's son, Matt filed the suit against rancher Nick Theos and his late mother's estate seeking thousands of dollars.
A jury decided Theos had no responsibility in the death and neither did the estate of his deceased wife Lois Robinson.
No criminal charges have ever been filed in Jim Robinson's death.