It's the circle of network life: Steve McPherson's Tuesday exit is a reminder that there's a life span to these jobs. Remember these past Alphabet shuffles?
:: Mark Pedowitz exits Disney-ABC TV Group: Feb. 3, 2010
:: Susan Lyne gets sacked: April 20, 2004
:: Lloyd Braun takes the bullet: April 5, 2004
:: Stu Bloomberg ankles Alphabet: January 7, 2002
:: Jamie Tarses out at ABC: Aug. 27, 1999
:: Ted Harbert hits the road: Jan. 8, 1997