How many baseball players have hit home runs in their last at bat?

In MLB, 7 players have done it.

1) Jim Gentile, 1961 Baltimore Orioles

2) Jim Northrup, 1968 Detroit Tigers

3) Frank Robinson, 1970 Baltimore Orioles

4) Robin Ventura, 1995 Chicago White Sox

5) Fernando Tatis, 1999 St. Louis Cardinals

6) Bill Mueller, 2003 Boston Red Sox

7) Josh Willingham, 2009 Washington Nationals.

and Moises Alou did it in the same inning off the same pitcher.