Very recently, I uploaded one of his packages with the following changelog entry:
* Switch Maintainer field to krap team and remove Matthew, he seems absent.
We hope he comes back.
I remember Matthew for his work on several KDE related packages in Debian, always doing a job that was better than I expected. And I especially remember him at Akademy 2008 where he to much joy brought a black horse whip for the chairman of a talkroom. And he even brouht a spare pink horse whip for when the black one broke. Especially Adriaan had a good use of that.
And at last, I will bring a image of Matthew showing off his equipment to Aaron Seigo.
Condolences to his family. Matthew will be missed.