It is very possible to shoot yourself twice in the head when committing suicide. I’ve seen it before with my own eyes after working at public shooting ranges. With a semi automatic handgun if you pull the trigger as fast as possible you may be able to squeeze off two rounds into your head before your neurons stop firing and your finger stops physically moving. It has the best chance of happening on a semi automatic handgun with a light trigger. It’s still unlikely to happen but it is not as hard as you think. The real question should be what type of firearm did they use to shoot themselves? It’s much harder to do with a double action revolver or similar firearm. Still and all around sketchy situation...