Who Killed Leopold Regal

The date is December 21, 1952. Now are the glory years of the American dream and the intrigue-filled world of the rich and powerful. Famous tycoon Leopold Regal, one of the most powerful figures in Ohio, is turning 77 years old. You his closest family and friends have been invited to celebrate his 77th birthday. During the party, Leopold wants to gather his guests together to read his last will and testament, but when they are all in the library, everything goes dark! A scream, and suddenly light returns, revealing Leopold lying dead on the floor with a knife in his back! His last will and testament is also missing! Find the will and you will find the killer! You have 1 hour! WHO KILLED LEOPOLD REGAL?