Mefisto in Onyx
"Rudy Pairis, an educated African American, is telepathic. His friend and one-time lover, deputy district attorney Allison Roche, wants him to slip into the mind of serial killer Henry Lake "Spanky" Spanning because after successfully damning Spanning to the electric chair for 29 murders, she has fallen in love with him and wants to be sure of his innocence. "--Goodreads.com.