A was driving a pair of horses without reins.  B was walking on the road and was intoxicated.  A called out to him twice to get out of the way but since the speed of the horses was high B was run over and killed. 

A trespassed into B’s house in his absence and no return B demanded A to leave but A refused to do so.  This led to an altercation which excited B who gave him a kick causing injury resulting in death. 

A takes up a gun, not knowing whether it is loaded or not, posits it in sport at B and pulls the trigger.  B is shot dead.