happened to me to first time through, after you free him he kills someone everytime you kill a demon, first he kills a couple of unknown's and you find their bodies and souls in the nexus, after that he starts on the NPC's in this order, freke's apprentice, patches, saint urbain, freke & then yuria
if you've not found him go up the first flight of stairs and into the room at the back, he should be in an alcove on your right, you can also find mephistopheles in here but you need pure black ct to trigger her side missions
and yuria teaches spells not miracles but they're different spells to what freke teaches you