Why shouldn't Jack Buckby put up at Batley and Spen? Just so long as he doesn't get in, which will be up to the voters.
It is a complete novelty, and an antidemocratic outrage, to suggest that by-elections ought to be uncontested if (so far) the previous MP has been murdered.
Shame on the Conservatives, the Liberal Democrats, UKIP and the Greens for not contesting this seat, which one of them used to hold, a mere year after they last did so.
As did TUSC, which ought to consider its position if the Labour candidate is not a worthy successor to Mike Wood, who was the MP for that seat this time two years ago.
But he was, and is, no Trotskyist. It ought not to be necessary to vote for TUSC. It ought to be possible to vote Labour in order to oppose austerity and wars.
Via the EU, we are already subject to the legislative will of the likes of Jack Buckby.
Via the EU, and even leaving aside his few, if any, degrees of separation from past and present members of the current British Government, we are already subject to the legislative will of the likes of Thomas Mair.
The growing controversy over her memorial fund's ties to the White Helmets in Syria indicates that Jo Cox was far from a perfect politician, and that the rush to canonise her is quite misplaced.
But her memory can indeed be honoured, both by voting and campaigning to keep her murderer's kind out of Parliament, and by voting and campaigning to free us from those of his kind who are already legislating for us.