When did the male die? Do you know what killed him?
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If you do decide to get another canary, keep in mind that you will want to keep the new bird separate from any of your current birds for at least four weeks. Quarantine is necessary to ensure that the new bird is in good health and not carrying any obvious diseases that could get your other bird(s) sick. You will also want to prepare for the possibility that the new bird will need to be permanently housed separately from your female canary, if they do not like each other.
I have not kept canaries, but from what I have read about them, two male canaries should not be housed together as they are territorial and they will fight. Two females may be housed in the same cage, as long as they have compatible temperaments and enough space. Keeping male and female canaries together is controversial. Some people say it is fine, but other sources say it should be avoided except if you intend for them to breed, because the male will harass the female in a confined space and the presence of a male might encourage too much egg laying, which can be very hard on the female, especially if she is not in breeding condition and provided with adequate calcium. Again, separate cages would be better than a shared cage, in this case.
In general, I would recommend holding off on getting a replacement bird. It isn't urgent, since canaries seem to do fine as solo birds.