DEFUNIAK SPRINGS, Fla. (Court TV) — A woman accused of killing a man before going on the run using disguises is facing new charges. Isabelle Johnson walks into court on Aug. 26, 2026. (Court TV) Isabelle Johnson, 38, was initially charged with first-degree murder in the death of Jason Coulthart, 43. Prosecutors have amended those charges to second-degree murder, abuse of a dead human body and tampering with evidence in a criminal proceeding, acc…