Before takeoff, the pilot received a partial weather briefing by telephone. He was advised of reported icing conditions and was told that snow and rain showers were moving through the area causing marginal VFR conditions. Before terminating the conversation, the pilot reportedly said he would try to fly VFR, but if unable, he would return. One of the passengers reported that the weather conditions worsened after departing and while traveling south he reported that they encountered heavy snow about 40 to 45 miles south of Bloomfield, Vermont and were forced to turn back. He stated the weather conditions became worse as they were going north, and snow forced them to circle and look for an emergency landing spot. Also, he stated that heavy icing caused a full throttle stall. The aircraft impacted in a wooded area and was destroyed. Two passengers were riding in back without seats or seat belts. One was killed. The other was thrown clear, and survived.