Whats the name of this movie?

I've been dying to find out the name of this movie in an effort to add it to my collection. The plot of the movie involves an African American male who works in a bank as a security guard. Men come to rob the bank and retrieve diamonds but the security guard holds the diamonds in an attempt to prevent the robbers from getting the diamonds. The robbers then choose to kidnap the security guards son. The main character goes after each man one by one to get his son back. A flash back shows the main character as a preacher in Africa who has witnessed killings of his village people during domestic war. In the end the main character dies in a church after getting his son back.