Almost a week after "Seinfeld" star Daniel Von Bargen attempted suicide by shooting himself in the head, an episode of the show entitled "The Suicide" -- during which Jerry Seinfeld jokes about people who try and commit suicide, but fail (see above) -- aired on TBS.

The episode originally aired in 1992 and Von Bargen, who played Mr. Kruger, didn't begin his stint on the show until years later. The episode aired again last night. TBS had no comment.

So we gotta ask ...

Daniel von Bargen -- who played Mr. Kruger in "Seinfeld" -- is clinging to life in an Ohio hospital after shooting himself in the head Monday morning in a failed suicide attempt ... and TMZ has the horrifying 911 tape in which he calls for help.

Daniel tells the 911 operator, "I've shot myself in the head ... and I need help."

The operator asks if it was an accident -- Daniel replies, "I was supposed to go to the hospital and I didn't want to." Daniel says he's diabetic, explaining, "They were supposed to amputate at least a few toes."

The operator asks where the gunshot wound is -- Daniel replies, "I shot in my temple."

Law enforcement officials confirm they were dispatched to von Bargen's Cincinnati apartment complex a short time later -- and when they arrived, you can hear them on the 911 tape ... yelling at Daniel to keep his hands where they could see them.

Von Bargen -- who also played Chief Grady in "Super Troopers" -- was transported to a nearby hospital where he is currently in critical condition.

During the call, Daniel goes into even more graphic detail about his condition. Listen at your own discretion.