Why people die in the summer?

I don't know what the hype is about death but it's amazing the number of death I have been announced this very last month:
- my mother's lover and best friend, he felt by accident or was beaten up to death. No one knows for sure... It happened the night before my birthday so she announced it to me while wishing me happy birthday. Hard to party after hearing such news;
- one last year MBA student, heart attack. I'm freaking out! Why am I working so hard if I'm to die in a few month like him?
- my hairdresser best friend committed suicide this week, my hairdresser is devastated and i got an appointment on Friday...:-(

That's it for this month. I haven't heard anything the rest of last year so why is everybody dying now as the summer has started? I also noticed a lot of people depressed or unsecure.
It makes me sad and depressed too.