But choose the topic title more carefully, at first I was a little annoyed because I thought this was a redundant topic. Lachance died in OB, he's not coming back, especially not 200 years later. He is dead. Deader than dead in fact. Dead as a doornail. He's kicked the bucket, bit the big one, given up the ghost, and all that jazz.
In fact, to use tvtropes, http://tvtropes.org/pmwiki/pmwiki.php/SortingAlgorithmOfDeadness/VideoGames:
Cause of Death: Overkill if I've ever heard of it, 4.
Genre: Anyone can die. Anyone. Even characters essential to the main quest. 4.
Body found: Eh, we'll be generous and be literal. We never see him buried, and the corpse is marred beyond recognition, we'll say 'at the morgue'. 3.
Reaction: All of the black hand members present have witty one liners about how they killed him. 4.
Last Words: Talked about how Applewatch was safe, and that he'd meet you there to root out the traitor. It's not too much of a stretch to justify a 4.
Characterization: Isn't in the main quest, only in this game. 3.
When did they die: It's been 5 years since OB, 3.
Have they died and come back: Not that we know of. 4.
Add them all up, divide by 8 to average them out.....
3.625 out of 4.
Yeah, he's dead.