This links to a statement from President Petro Poroshenko's office on the killing of journalist Pavel Sheremet:
Boris Nemtsov with Pavel Sheremet. Now both no longer with us...
Here's a live feed from RFE/RL's Ukrainian Service of a memorial event being held for slain journalist Pavel Sheremet on Kyiv's Independence Square:
From RFE/RL's correspondent in Kyiv: