Who said "Death is the only certainty in life."?

This quote is attributed to Sherlock Holmes.

Death is the only certainty in life. - Sherlock Holmes

"Death is the only certainty in life."

Sherlock Holmes Death

"The game is afoot!"

"Elementary, my dear Watson."

"When you have eliminated the impossible, whatever remains, however improbable, must be the truth."

"I am not a romantic, but I am a realist."

"Death doesn't scare me anymore."

"Death and I are old friends."

"Welcome to my world."

"Death is just the beginning."