HOW CAN I STOP THIS MAN FROM DOING THIS TO OTHER GIRLS?

A MAN CONTACTED ME VIA FACEBOOK STATING THAT AT FIRST HE WAS A FEMALE, AND THAT I SHOULD MODEL FOR HIM HE ALSO SAID HE WAS A FAMOUS FOOTBALL PLAYER. WITHIN A MATTER OF 6 HRS I FOUND OUT EVERYTHING FROM THE MANS REAL NAME TO HIS PLACE OF EMPLOYMENT RIGHT ALONG WITH HIS HOUSE INFORMATION.(BACKGROUND SEARCH) HE HAS BEEN SCAMMING GIRLS INTO BELIEVING HE IS A CELEBRITY AND WHEN THEY FIND OUT THE TRUTH HE JUST BLACKMAILS THEM AND THREATENS THEM. I CONTACTED THE POLICE BT THEY DONT SEEM TO CARE..THE YOUNGEST GIRL HE HAS HAD SEX WITH HAS BEEN 17 BT SHE IS SCARED AND WONT COME FORWARD. HE IS 44 AND MARRIED.I NEED TO KNOW WHAT CAN I DO BECAUSE HE IS BLACKMAILING ME STATING THAT HE WILL RELEASE PICS OF ME TO THE PUBLIC AND HE IS JUST AN OVERALL LIAR AND HE HAS CONTACTED SEVERAL OF MY FEMALE FRIENDS BT I INFORMED THEM SO HE DIDNT GET VERY FAR. HE HAS BEEN DOING THIS FOR 2-3 YEARS..HE MUST BE STOPPPED..BT HOW CAN I?