R.I.P. Buster

I found my friend, usually very noisy, on the bottom of his cage in a position that wasn't upright. It surprised me and saddened me. I loved my little bird. It saddens me not to hear his voice or see him flit around anymore. In fact, the empty cage is a constant reminder that he is no longer with me. I struggle with trying to figure out whether we should get Kiwi a new companion or I should dismantle the cage. I don't want Kiwi to be lonely, but I sit and wonder how much interaction he gets with Gabriel and I talking to him and the cats bugging him...if it is enough. Above all, I just miss Buster.