http://www.abpic.co.uk/search.php?q=N618JC&u=reg Second picture down gives other registrations; Became SE-DCK to N303LA, N69WW, N21BC, N93JR, N18JL, N1EC
http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=n1EC Under de-registered aircraft, AERO COMMANDER 1121 c/n 51
https://www.planelogger.com/Aircraft/ConstructionList/Rockwell%201121 look under c/n 51 about half way down the page
51 Rockwell 1121- N618JC Jet Commander
SE-DCK Private Owner Left Fleet
N303LA Lakala Aviation Left Fleet
N303LA Scope Inc Left Fleet
N303LA National Financing Left Fleet
N69WW Private Owner Left Fleet
N21BC Private Owner Left Fleet
N93JR Triple D Corporation Left Fleet
N18JL John F. Lawhon Furniture Company Inc
N18JL T. Smith & Son Inc Left Fleet
N18JL H & L Air Company Left Fleet
N18JL Corporate Jet Service Inc
N18JL Cheque Jet Inc Left Fleet
N1EC Cheque Jet Inc Scrapped
Hope this helps
Walt