Question: What sport did a star of 1976 blaxploitation film: "Dr. Black, Mr. Hyde" play professionally?

Context articles: Dr. Jekyll and Mr. Hyde (1913 film)
No Way Back (1976 film)
Bernie Casey
Dracula (1968 film)
Dr. Jekyll and Mr. Hyde (1920 Haydon film)
Strange Case of Dr Jekyll and Mr Hyde
Dr. Jekyll and Mr. Hyde (video game)
Dr. Black, Mr. Hyde
Dr. Jekyll and Mr. Hyde (1941 film)
Dr. Byrds &amp; Mr. Hyde

Dr. Jekyll and Mr. Hyde is a 1913 horror film, directed by Herbert Brenon and Carl Laemmle, written by Brenon and produced by Laemmle.
 The picture is based on the Robert Louis Stevenson story "The Strange Case of Dr. Jekyll and Mr. Hyde" and stars King Baggot in the dual role of Jekyll and Hyde.
 The film was re-released in the US in August 1927.
No Way Back is a 1976 blaxploitation film written and directed by Fred Williamson, who also stars as Jesse Crowder, a private detective who once used to belong to a police force but that now finds himself taking odd jobs for a little extra money.
 Catchphrases include “ Never trust a woman with her clothes off!”
 and “You pay the bill.
 I’ll deliver it, legal, illegal, moral or otherwise!”
Bernard Terry Casey (June 8, 1939 – September 19, 2017) was an American actor, poet, and professional football player.
Dracula is a video-taped television play adaptation of Bram Stoker's novel "Dracula", part of the series "Mystery and Imagination" (Season 4, Episode 3).
 Denholm Elliott (who later co-starred with fellow-Dracula Jack Palance in "The Strange Case of Dr. Jekyll and Mr. Hyde") played Count Dracula with Susan George as Lucy Weston (another alumn of another version of "Dr. Jekyll and Mr. Hyde").
Dr. Jekyll and Mr. Hyde is a 40-minute horror film of 1920, directed and written by J. Charles Haydon.
 It is the second of three adaptations of Robert Louis Stevenson's novel "Strange Case of Dr Jekyll and Mr Hyde" to be released in 1920.
 (The first 1920 adaptation is "Dr. Jekyll and Mr. Hyde" starring John Barrymore and the third is "Der Januskopf", directed by F. W. Murnau).
 The Haydon version is somewhat overshadowed by the version starring Barrymore which was released by Paramount Pictures the same year.
Strange Case of Dr Jekyll and Mr Hyde is a gothic novella by the Scottish author Robert Louis Stevenson first published in 1886.
 The work is also known as The Strange Case of Dr. Jekyll and Mr. Hyde, Dr. Jekyll and Mr. Hyde, or simply Jekyll & Hyde.
 It is about a London lawyer named Gabriel John Utterson who investigates strange occurrences between his old friend, Dr Henry Jekyll, and the evil Edward Hyde.
 The novella's impact is such that it has become a part of the language, with the very phrase "Jekyll and Hyde" coming to mean a person who is vastly different in moral character from one situation to the next.
Dr. Jekyll and Mr. Hyde is a 1988 side-scrolling action video game for the Nintendo Entertainment System loosely based on the novel "Strange Case of Dr Jekyll and Mr Hyde".
 Gameplay alternates between the characters of Dr. Jekyll and Mr. Hyde based on the player's ability to either avoid or cause damage.
Dr. Black, Mr. Hyde is a 1976 blaxploitation horror film loosely inspired by the novella, "The Strange Case of Dr Jekyll and Mr Hyde" by Robert Louis Stevenson.
 The film stars Bernie Casey and Rosalind Cash and was directed by William Crain, who had also directed the successful "Blacula" for American International Pictures in 1972.
 Along with Crain, the film was written by Larry LeBron and Lawrence Woolner with cinematography by Tak Fujimoto.
 The movie was filmed primarily in Los Angeles and at locations such as the Watts Towers.
 Along with other blaxpoitation films, "Dr. Black, Mr. Hyde" is filled with themes surrounding ideas of race, class, and black power, yet it is unique in that the film depicts these themes through the genre of horror.
Dr. Jekyll and Mr. Hyde is a 1941 horror film starring Spencer Tracy, Ingrid Bergman and Lana Turner.
 Rather than being a new film version of the novel, it is a direct remake of the 1931 film of the same title, which differs greatly from the novel, due to both films' heavy dependence on the Thomas Sullivan stage version.
 The movie was based on Robert Louis Stevenson's 1886 novella the "Strange Case of Dr. Jekyll and Mr. Hyde" and directed by Victor Fleming, director of "Gone with the Wind" and "The Wizard of Oz" two years earlier.
 Metro-Goldwyn-Mayer (where Fleming was based) acquired the rights to the 1931 film, originally released by Paramount Pictures, in order to keep the earlier film out of circulation.
 Every print of the 1931 film that could be located was destroyed , making it essentially a "lost film" for decades except for clips until a full version was found and restored.
Dr. Byrds & Mr. Hyde is the seventh album by the American rock band The Byrds and was released in March 1969 on Columbia Records ("see" 1969 in music).
 The album was produced by Bob Johnston and saw the band juxtaposing country rock material with psychedelic rock, giving the album a stylistic split-personality that was alluded to in its title.
 It was the first album to feature the new band line-up of Clarence White (guitar), Gene Parsons (drums), John York (bass), and founding member Roger McGuinn (guitar).
 "Dr. Byrds & Mr. Hyde" is unique within the band's discography for being the only album on which McGuinn sings the lead vocal on every track.