Amy Gellert was killed in Cocoa Beach , California , on March 20 , 1994 . Killer also murdered her stepfather Robert Lehton and mother Charlotte . Motive for slaying remains unclear , but investigators say ' Amy 's the killer ' Police have investigated suspects over the years but never made any arrests . Cold case was featured on episode of 48 Hours that aired on fox .
Amy Gellert was killed in Cocoa Beach , Florida , on March 20 , 1994 . Killer also stabbed her stepfather Robert Lehton and mother Charlotte . Motive for slaying remains unclear , but police say 'Amy 's the catalyst ' Police have had suspects over the years but never made any arrests . Cold case was featured on episode of 48 Hours that aired on Saturday .