Manglik dosha is a very loose term. Location of Mars in several houses, which apply to large number of people.
Lifescape astrology is much more precise. for one's husband to die, minimum is adverse angle of Jupiter and Moon and Sedna.
this topic we are defining at our website http://lifescapeastrology.com
In case you want us to analyse the cases, where some one's husband died, you can add the data at forums and we will add chart and explanation.
But it is imperative, that no husband suffers because of Manglik Dosha. If mars is afflicted, then it shows neation in married life of woman, which may be discord, separation or simply some feminine health problems, if mars is making aspect with earth or ceres.
If mars is making aspect with mercury or neptune, this also just tells about desires of woman.
so please thoroughly test the theory and help us in removing the myth of manglik dosha.