Cassandra Clare said this quote

Will. For a moment her heart hesitated. She remembered when Will had died, her agony, the long nights alone, reaching across the bed every morning when she woke up, for years expecting to find him there, and only slowly growing accustomed to the fact that side of the bed would always be empty. The moments when she had found something funny and turned to share the joke with him, only to be shocked anew that he was not there. The worst moments, when, sitting alone at breakfast, she had realized that she had forgotten the precise blue of his eyes or the depth of his laugh; that, like the sound of Jem's violin music, they had faded into the distance where memories are silent.