Did Heinz Linge kill Hitler?

Hugh Thomas, in his book "The Murder of Adolf Hitler," puts forth a theory about Hitler's death that MAY explain various Bunker resident's contradictory statements about where the fatal gun wound was located, as well as why no shot was heard.

As Thomas paints the scene, "He (Hitler) is still shuffling around the anteroom when Linge returns. Linge... offers him a cyanide capsule from a small brass case, and the use of the Army pistol that Linge withdraws from the drawer of a table. Staring blankly and uncomprehendingly at his manservant, Hitler calls him a 'stupid peasant' and turns his back."
"Linge picks up the cyanide capsule and vainly tries to force it into Hitler's mouth from behind--forcing the mouth open by closing his powerful middle finger and thumb across the Fuhrer's mouth, from side to side in the cheek pouch. Despite his feeble state, Hitler manages to turn his head away from the strong grip and lower his head. Linge's increasingly violent efforts can't succeed, even though he is by now half facing the Fuhrer."

"But the affront has been made, the first act of violence committed. Savagely Linge turns the prematurely aged man around and throttles (strangles) him from behind. Terrified, he holds up the Fuhrer in front of him while the frothing stops and struggles cease."

"He is still holding the corpse almost at arm's length, when Stumpfegger comes into the room... Stumpfegger beckons Linge to lay the corpse down on the floor. Checking that Hitler is dead, he reaches in his pocket and produces an ampule-crushing forceps. The cyanide capsule is quickly and professionally crushed under Hitler's protruding tongue."