Who said "The dead do not speak, but I will speak for them."?

This quote is attributed to RoboCop.

The dead do not speak, but I will speak for them. - RoboCop

"The dead do not speak, but I will speak for them."

RoboCop Justice

"I'd buy that for a dollar."

"Serve the public trust. Protect the innocent. Uphold the law."

"I am a law enforcement officer."

"Dead or alive, you're coming with me."

"Justice must always prevail."

"You think I'm just some animal?"

"Fighting for what's right never gets easier."

"Justice is worth fighting for."