He killed himself in a different fashion in Acts 1:18. But your point is still well taken.
Nobody believes that the disciple Matthew wrote the gospel of his name, either.
If you're saying that few people believe that Matthew actually sat down and physically wrote out the text of Matthew in Greek, then sure.
But there is no reason to doubt that the Gospel of Matthew was originally composed by amanuenses of the disciple Matthew.
"Nobody believes that the disciple Matthew wrote the gospel of his name, either." ~ Dog Gone
Being dubious about the "written directly" claims is one thing, but when some of them question the "authorship" of the canonical gospels, that's where they go off the deep end.
"With these general considerations http://www.tektonics.org/ntdocdef/gospdefhub.html , we now offer these mini-essays on each Gospel."