He is best known as a former operative for the Federal Bureau of Investigation (FBI) during the case against suspected serial killer Larry Hall.

It was adapted into an award winning Apple TV+ series Black Bird in 2022, on which he acted as executive producer.

[1][2] Keene attended Kankakee Eastridge High School[3] and then Triton College, where he was a standout athlete.

Prior to his sentencing, Keene refused and declined any cooperating deals that would require him to act as an informant against anyone.

[7] Keene was a former operative for the FBI who worked to gather incriminating evidence on suspected serial killer Larry Hall.

[8] The redemptive plan involved him being recruited and working as a post-trial FBI operative that would transfer to the Medical Center for Federal Prisoners (MCFP).

[7] Keene was tasked with befriending Hall, a man suspected of raping and murdering dozens of young women between 1980 and 1994.

[20][21] In 2010, Keene released an autobiographical account of his time working as an FBI operative helping to secure the conviction of serial killer Larry Hall.

[25][26][27] In 2024, Keene released his fourth book, The Wanderer: Bigamy, Deceit and Murder, which is a suspenseful and thrilling, crime fiction.