Mark Blankenship entered a plea Wednesday to a count of conspiracy to obstruct justice.
Prosecutors say Blankenship and Knight's girlfriend arranged to sell surveillance video from a Compton hamburger stand of Knight hitting two men with his truck in 2015. One man died.
TMZ bought the video for $55,000 after a judge in Knight's murder case had barred its public release.
Blankenship was sentenced to five years of probation and ordered to pay $55,000 in restitution to the hamburger stand.
His co-defendant, Toi-Lin Kelly, pleaded no contest to conspiracy in 2017 and received probation and community service.
Knight is serving a 28-year sentence after pleading no contest to voluntary manslaughter.
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