Former football star Michael Strahan is leaving the daily talk show he co-hosts with Kelly Ripa to work full-time on “Good Morning America.” ABC said Tuesday that a search for Strahan’s replacement will begin in the fall. The former New York Giant was selected in 2012 to replace Regis Philbin as Ripa’s co-host on the talk show, which airs at 9 a.m. in most markets. According to the Associated Press, he’s joining the show’s regular cast of Robin Roberts, George Stephanopoulos, Lara Logan, Amy Robach and Ginger Zee. “Good Morning America” leads the network morning shows in ratings. However, its competition with second place “Today” on NBC has gotten tighter in recent months.