What word begins and ends with an E, but has only one letter?

A person was found dead on a big green land with no trees or buildings around. When the police arrived, they found a piece of rock lying next to him and the man was wearing clothes comprising of red, blue and yellow colours.

Can you tell who the person is and what was the cause of death?

I have a clock(12-hour format) and both the needles of the clock overlap at 12:00.
After how much time, they will overlap again?

I hide my treasure in the ground, my tail is big and fluffy. If you spot me in a tree, please don’t call me scruffy. What am I?

Lifeless eyes on my smiling face and watch your child's sleeping place. In their dreams they hold me tight. What am I?

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?

I am the fastest animal but cannot climb the tree. What am I?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

The more of this there is, the less you see. What is it?