Shrimpers lose vital match in play-off race
Southend's 2-0 loss to MK Dons leaves them five points of the play-off places with four games left to play.
The Dons Mark Wright headed in Stephen Gleeson's right-wing cross after they had soaked up early Southend pressure.
Dons goalkeeper Willy Gueret denied Theo Robinson and Southend's Lee Barnard also had a header cleared off the line.
But the Shrimpers' fate was sealed in injury time Gleeson by Wright's second, stroked home from just inside the box.