welcome to GoY.
that is a shame.when did it show signs of trouble?
I'd be tempted to remove it and replace it with another. but why has it died? has there been any work carried out near its roots? has drainage routes changed.

as for camouflage well a trellis in front with an evergreen climber such as ivy, clematis or honeysuckle would hide it.

I think if you cut the dead one out. Cut it to the ground and get rid of it. The two live ones on either end will fill in the gap very quickly.

It looks like Thuja plicata and I would say that Bathgate's suggestion is spot on.