In 1959 they decided to excavate Bed I. While Louis was sick in camp , Mary discovered the fossilized skull OH 5 , which Mary called `` Our Man '' , and became `` Dear Boy '' and `` Zinj . '' In 1959 they decided to excavate Bed I. While Louis was sick in camp , Mary discovered the fossilized skull OH 5 at FLK , which Mary called `` Our Man '' , and became `` Dear Boy '' and `` Zinj . ''