In mid-December 2011, a Florida couple, Kelly Moriarty and Doris "Pat" Carter, disappeared. Weeks passed before they were reported missing, causing a delay in the investigation. Suspicion has fallen on some of Pat's family members, but no one has been charged, and the case remains unsolved.

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Sources: 

https://www.newspapers.com/image/319150562/

https://www.newspapers.com/image/669252759/

https://www.newspapers.com/image/319189077/

https://www.newspapers.com/image/364314835/

https://www.newspapers.com/image/364460672/

https://www.newspapers.com/image/343318573/

https://www.newspapers.com/image/343253063/

https://www.plantcityobserver.com/police-still-searching-leads-missing-women-case/ 

https://www.bradenton.com/news/local/crime/article34565697.html 

https://www.plantcityobserver.com/what-happened-kelly-moriarty/ 

https://www.tampabay.com/news/publicsafety/crime/family-still-seeks-justice-after-three-years-in-severed-leg-case-wvideo/2211649/ 

https://www.fox13news.com/news/family-of-murder-victims-seek-justice-despite-stalled-investigation 

https://www.youtube.com/watch?v=CE3W-UGSvYc 

https://www.wtsp.com/article/news/crime/project-cold-case-severed-leg-kelly-moriarty/67-0c8b8cc1-d377-4a00-ac59-cab1a74dface 

https://www.abcactionnews.com/news/local-news/i-team-investigates/nonprofit-brings-new-awareness-to-over-decade-old-florida-cold-case-where-womans-severed-leg-washed-ashore 

https://www.legacy.com/us/obituaries/tampabaytimes/name/william-carter-obituary?id=39353446