He will be stepping down from anchoring PBS' nightly news broadcast after three dozen years, though remain with the network in other roles. His last broadcast will be June 3 - around the same time the anchor chair at CBS will be undergoing a switch.
http://weblogs.baltimoresun.com/entertainment/zontv/2011/05/jim_lehrer_stepping_down_from.html
http://weblogs.baltimoresun.com/entertainment/zontv/2011/05/jim_lehrer_stepping_down_from.html