What does it mean if you dream of running from a killer?

it doesent really mean anything. you were just having a nightmere or you were watching a scary movie or read a scary book befor you went to bed.....

Running from something (or someone) in a dream suggests the dreamer is running away from a problem in real life. The "killer" suggests that the problem feels serious and frightening. The dreamer might feel that something awful will happen (in real life) if he/she makes the wrong choice or does not handle the issue well, and so is trying to avoid the problem by running from it. The dream might occur repeatedly until the dreamer solves the problem in real life.