Arrow to Picket Fences

Hudson University is the fictional University where many Law & Order characters graduated as well as the location of F.I.R.E.S.T.O.R.M. On Arrow

Law and Order and Homicide crossed over on four episodes

Chicago Hope's Jeffrey Geiger accepted an organ of a victim on Homicide

Cushing Left Anterior Descending Artery Award later won by Chicago Hope's Kate Austin.