I read somewhere it is Colin. He still loves her, and this is his misguided way to show it. I believe it is Colin and we'll only see torso-down shots of him for a while. Physically, it certainly looks like the actor. I find it a little comical (as long as it is Colin), that she is handcuffed to a bed, since that is how he went off the show, but she had handcuffed him with fur-lined cuffs, no less.
The music box connection has me stumped though. Especially since Mrs. C left it to her and she hated him.