An accident between a school bus and truck leaves one Iowa man dead.It happened in Northern Polk Co. Iowa Monday afternoon just south of Alleman.Emergency responders arrived to find Robert Black, Jr. was already dead his daughter 21 year old Katherine Black, a passenger in the truck was not injured.The school bus was carrying 48 students from North Polk and Alleman schools.The school bus driver told deputies that Black was slowly drifting into the bus' lane and he couldn't avoid the crash.Officials says Black's pick-up truck and the school bus crashed head-on.