You wouldn't have to go to Florida - Go to the police in YOUR city - get THEM to call in a sketch artist. Police communicate with out of state police all the time. They could do the sketch and FAX it or scan and email it to Florida.
You have the name of the street (Briarwood), a discription of the killer's car, the name of the dogs, AND the first name of the Killer (Kevin)--Get on down to your local police station ASAP! If that doesn't work, go to the media! Call the TV stations and newspapers in and around Orange Park and Jacksonville, Florida! SOMEONE will check out your information.
If all else fails, contact NG. I know she has had physics on her show before. Make someone, somewhere listen. Don't just say, "I can't."
I am one of the ones who do NOT believe anyone can call up the dead and get information from them, but if I were a member of Orange Park LE, you bet I WOULD check your story out...in a heartbeat!