Conversation so far:
Are Everblack and Abysmal album titles for the band The Black Dahlia Murder?
Studio albums. Everblack, 2013. Abysmal, 2015.
Which one was released first, Everblack or Abysmal?
Everblack, 2013
Did Everblack by the band The Black Dahlia Murder do well?
The album sold 13,000 copies in the United States in its first week of release and debuted at position #32 on the Billboard 200
Did Abysmal by the band The Black Dahlia Murder do well?
Are The Black Dahlia Murder band  working on anything new?
In a post to Twitter, The Black Dahlia Murder frontman Trevor Strnad reports he has finished his work writing the bands new album due out late in 2019 or early in 2020 via Metal Blade Records.
Why did Knight leave the band The Black Dahlia Murder?
Concentrate on other aspects of his life to ultimately be happy and keep moving forward; be teaching guitar, working on new music, and just getting pretty domestic in general.
Was there any other changes to the band The Black Dahlia Murder besides Knight?
Knight was replaced on lead guitar by Brandon Ellis of Arsis
Are there any other interesting aspects about the band The Black Dhalia Murder article besides Knight leaving, Abysmal, Everblack and the new album due late 2019 early 2020?
On November 28, 2014 (the day after Thanksgiving), The Black Dahlia Murder released a 7 EP titled Grind 'Em All
How did EP Grind 'Em All do for the band The Black Dhalia Murder?
Which album did the best in sales during 2013-2016, Everblack or Abysmal?
Was there any conflicts in The Black Dahlia Murder during 2013-2016?

Question: Had Ellis worked with them before?
Self-contained rewrite: Had Ellis worked with the band The Black Dahlia Murder before prior to joining to replace Knight?