I just have a feeling about this.
Why Female Praying Mantises Devour Their Partners During Sex
In praying mantises, around 25 percent of all sexual encounters result in the death of the male. The female typically begins by biting off her partner's head, and she works down from there. Incredibly, this comprises about 63 percent of the female's diet during the mating season.
https://gizmodo.com/why-female-praying-mantises-devour-their-partners-durin-1782818376