Do you think this is some detective novel written by a second-rate author?
Even Dean was somewhat speechless. "Holz, it's nearly impossible to suffocate oneself. The body has a will of its own."
This 'will' is the body's instinct for self-preservation.
Essentially, even if the consciousness no longer wants to live, the body believes it can still be saved. It ignores the consciousness's control and makes involuntary reactions...
So, holding one's breath to commit suicide is almost unachievable. Humans have their limits.
Dean leaned towards the theory that Mike Smith had suffered a complete mental and physical breakdown, the agony of which led to suffocation.
In any case, Mike Smith died a torturous death.
This made Dean even more certain of his hypothesis: the killer harbored an intense hatred for Mike Smith!
He looked at Holz. "By the way, that Akita dog, have you checked on its condition?"