Fothergilla gardenii
dwarf witch-alder
This is what was in the front that died. It is a spring bloomer.
Clethra alnifolia
summersweet
This is could be a good replacement. It blooms in summer. One of my favorites. I have one that is about 3 feet tall now, it should grow to 6 feet. Tough plant in the right conditions. Likes sun and water but can cope with a dry spell.