Shrewsbury goalkeeper Chris Weale fouled JP McGovern in the area on 68 minutes and Miller put United back on terms.
The game ended 2-2 but there was worse news for Carlisle with winger Matty Robson limping out of the game after only nine minutes with a suspected back problem
More top news
On the first day of the meteorological Autumn - what will the weather have in store?
The First Minister will introduce standardised tests in primary schools, and a number of other bills in the next Parliament session.
Vern Cotter has announced the Scotland squad for the 2015 Rugby World Cup, and three players from the Scottish Borders are included.