Character names for a story?

I want to write a murder mystery story I already have some of the names they are Juliet Evanwood (main character) and her friends; Elizabeth Cole, Allison Brent and Ashton Hale. The person murdered is Lucas McArthur. All the friends witness his murder. I need help on the names of the cops, the person who murders Lucas, his parents and/or siblings and any other people you want to add. Feel free to edit the names I already have. Thanks! :P