An old wallet belonging to a convicted killer who has long been a "person of interest" in the unsolved murder of a Massachusetts girl may be the break cops have sought for 12 years.

Molly Bish, 16, of Warren, Mass., disappeared in June 2000 from a local pond where she worked as a lifeguard. After the largest search for a missing person in Massachusetts history, Bish's remains were discovered three years later about five miles from her family's home.

Rodney Stanger, a 64-year-old native of Southbridge, Mass., who was living in the area at the time, emerged as a person of interest in 2009. Stanger, who abruptly moved to Florida following Bish's disappearance, is serving a 25-year prison term for the 2008 stabbing death of his live-in girlfriend, Chrystal Morrison, in Summerfield, Fla.

Fox affiliate WFXT-TV reported that Morrison's sister, Bonnie Kiernan, recently traveled to the Florida trailer home where the couple lived to retrieve items belonging to Morrison.