The last time I checked on them, last night, they were still mating. This morning, the male was gone. Only a bit of wing and part of a leg were left in the bottom of the cage.
This might seem like a bad end for the two "husbands", but the alternative would have been for them to decline and die anyway in the weeks to come. Instead both males gave not only their DNA, but their very flesh and blood, which, as it nourishes the now very fat female mantis, will hopefully result in a nice healthy egg case.