Okay, coffee drinkers, have you wondered: How Much Caffeine Will Kill A Person?
I'm going to assume this question is only inquisitorial in nature and you have no homicidal or suicidal thoughts.
You're correct in that caffeine in high doses can kill you. There have been numerous deaths attributed to excessive caffeine ingestion.
However, the actual dose that will kill a person is somewhat difficult to answer.
There are several factors that make this a tricky question. Not everyone reacts the same way to caffeine. People also become tolerant to it and so the effects can be different from person to person. Lastly, there would be no respectable researcher who would dare perform a study on humans, if the goal of that study is death to that same person.