IMO the females were killed by the male. You can try a long drawn-out introduction, by placing them in two wire cages next to each other once or twice per day. On top of that, set up the female in her own habitat similar to your male's, and let several months go by. Then under supervision, introduce the male into the female's habitat. He won't be as likely to defend someone else's territory. I would supervise a few dozen one hour get-togethers before I would feel only a little queasy about unsupervised visiting.

As I remember from reading posts, breeding lizards who don't cohabitate is done by putting the male into the female's habitat.

Roger