It tells the story of the serial killer, who murdered four men, Anthony Walgate, Gabriel Kovari, Daniel Whitworth and Jack Taylor between 2014 and 2015, from the perspectives of the families of the victims.
The three-part series focuses on the fight to uncover the truth about what had happened to their lost sons, brothers and loved ones in the face of a now widely condemned police investigation.
In a departure from his usual comedic roles, Stephen Merchant will portray the serial killer, who raped his four victims and gave a fatal dose of GHB in his flat in Barking, East London.
Sheridan Smith will play Sarah Sak, the mother of one of Port's victims, Anthony Walgate, and other cast members including Jaime Winstone, Rufus Jones and Stephanie Hyam.
The drama was first announced in August 2018, and was expected to be released later that year, but experienced significant delays.
Three years on, the factual drama will finally air over three consecutive nights from Monday 3 January on BBC One at 9pm.
All three episode will also be available to watch on BBC iPlayer from Monday 3 January.
The series - produced by Jeff Pope and Neil McKay - was initially titled The Barking Murders after the location where the murders were committed.
However, producers decided to change the name in order to honour the four lives that were lost and their families.
"With a title like The Barking Murders, the creators thought it might have sounded too much like a conventional police procedure drama," a source previously told The Sun last year.
"The show is very much about the four young lives snuffed out and the deaths that could have been prevented."
Watch Four Lives on Monday, January 3 on BBC One at 9pm and BBC iPlayer.
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