You could not have known, no way, no how. Professionally, I often have experience with mentally ill persons and the consumers who announce they are suicidal usually are not serious (notice I said usually, every threat should always be taken seriously because you never know). But the vast majority of consumers who did commit suicide, we had no warning, no notice, no inkling. They were serious about ending their life and did not want anyone to stop them. And they were successful. Sadly so. Hug your dear hubby close and your sweet new baby closer.