Enda Curran got United back into it when he scored from the spot 15 minutes from time, but the Galway native would see red before the full-time whistle.
Treaty United tasted defeat once more on Monday evening, as they lost 2-1 away to Kerry FC in the League of Ireland First Division.
The Shannonsiders remain eighth in the table after the defeat in Mounthawk Park, but are now just three points clear of the Kingdom, and ten adrift of the playoff positions.
This is just Kerry’s third win of the season, having struggled for points, and goals even, all term.
Tommy Barrett’s men finally snapped what turned into a 14-game winless run last Friday with a victory over Longford Town, but it was back to losing ways on Monday, as Kennedy Amechi helped down the Blue Army.
Amechi poked past Corey Chambers to give the hosts the lead after just eight minutes, the 19-year-old’s right footed effort finding the bottom left corner.
Kerry had the better of the chances in the opening half, the visitors saved by both Chambers and the woodwork, as they headed into the interval one goal behind.
Less than ten minutes had gone in the second 45 when Evan O’Connor had the ball in his own net, the defender getting caught up as he tried to defend a low cross into the area.
Enda Curran got United back into it when he scored from the spot 15 minutes from time, but the Galway native would see red before the full-time whistle, receiving his marching orders for an incident involving a Kerry defender.
Barrett’s side are back in action this Friday, as they welcome Bray Wanderers to the Markets Field.