(AP) - The mother of a prostitute whose remainswere found in a Long Island marsh says she believes her daughterwas murdered by a serial killer, and wants federal authorities totake over the investigation.

A lawyer for the family released a letter to the JusticeDepartment on Tuesday requesting that the FBI lead an investigationinto the death of Shannan Gilbert, and 10 other people whoseremains were found scattered along Long Island's Atlantic coastover the past year.

Attorney John Ray says he thinks police bungled theinvestigation from the beginning. Gilbert's mother says she doesn'tbelieve a police theory that her daughter drowned accidentally.

Her remains were discovered near Oak Beach last week after ayearlong search.

A cause of death has yet to be determined.

Police: Remains found on LI identified as Shannan Gilbert

LI police come up empty-handed after search for Jersey City woman Police find purse, other items belonging to missing NJ prostitute LI police to continue beach search Wednesday Cops: Human remains possibly found at 2 locations on Long Island Police: Shannan Gilbert's body may be at LI beachRemains found near Long Island beach not missing NJ womanA look at the bodies' investigation on Long IslandInvestigators search on Long Island for more evidence, bodies