Crawlspace

How would you diagnose Dr. Gunther?

Landlord Dr. Karl Gunther deliberately cuts himself before placing the muzzle of his revolver against his head, as though to kill himself, and pulling the trigger, with the hammer falling on an empty chamber. (0:03)

Hank Peterson and Gunther watch Sophie Fisher from outside.
Hank tells Sophie, “... Sweet...” (0:07)

College student Lori Bancroft tells Gunther, "... What a nightmare..." 
Gunther holds his hand over a flaming burner on the kitchen range. (0:15)

Gunther: "... I am addicted to killing... I finished medical school..." (0:17)

Gunther tells tenant Harriet, "... I don’t drink alcohol..." 
Harriet: ”... drugs...” (0:19)

Harriet tells the other tenants, referring to a man friend, "... lazy as a pig..." (0:22)

Lori tells Gunther, "... It’s more like The Exorcist." (0:24)

Gunther: "... was shocked to learn..." (0:25)

Gunther watches Sophie through the window. 
Hank watches Sophie through the window. (0:26)

Gunther places the muzzle of his revolver against his head and pulls the trigger, with the hammer falling on an empty chamber, then does it again. (0:29)

Josef Steiner tells Gunther, "... I’m a very tenacious man..." (0:31)

Steiner tells Gunther, "... died... my brother." 
Gunther: ”... some of my patients died...” (0:32)

Gunther: "... perform my other everyday medical procedures... undetected injection... Killing is my heroin, my opiate, my fix..." (0:36)

Alfred Lassiter tells actress Jessica Marlow, "... I find you absolutely charming." (0:40)

Posters: ... Prisoners of the Casbah, By the Light of the Silvery Moon, The Perfect Furlough, A Slight Case of Larceny, This Angry Age (0:41)

Gunther writes, "... in order to explore this addiction to death..." (0:48)

Steiner answers Lori, "Compulsive personality type..." 
”... Your sister Kate died...” 
”I believe Dr. Karl Gunther killed my brother.” 
”... Dr. Karl Gunther killed my brother...” (0:52)

Gunther places the muzzle of his revolver against his head and pulls the trigger, with the hammer falling on an empty chamber, then does two more times. (0:56)

Adolf Hitler on movie screen (0:58, 1:11, 1:13)