What object can you kill someone with that will leave no evidence?

Question

What object can you kill someone with that will leave no evidence?

Answer 1

Water.   Drowning would be hard to prove.

Answer 2

Love them to death, the only evidence will be a smile and that will work to your advantage when they arrest you

Answer 3

Smother them to death in their sleep with a giant block of ice.

When the ice melts, there will be no evidence.

Answer 4

Kindness.

Answer 5

A massive leg of frozen lamb or any other edible animal. Hit them with it and then cook it and feed it to friends, family and neighbors. Then you're left with no evidence.