Dr. Haldejian?!

Dr. Haldejian?

Dr. Haldejian and the tour's other saddle-sore dudes gazed down upon 2 rotting pieces of timber.
"Now this here spot," intoned their unshaven little guide, "is called Bushwack Alley, bein' so known for the shootin' of two deputies back in '73."
"Elbow Bend was a thrivin' town in them days, and Doc Pressman's house stood right here. One night there's some gunplay in back, and a stranger staggers into Doc's kitchen."
"The doc removes a .44 slug from the stranger's upper back, loans him a clean shirt, and fixes his right arm in a sling."
"Says the stranger: 'I was crossin' South Street when I heerd gun-fightin' and seen a fella runnin' from two lawmen. I joined the chase. The fella ambushed us in the deadend behind your hours, Doc, killed the lawmen, and wounded me.'
"Just then Sheriff Pell and Clyde Everest, the local undertaker, stormed in."
"I bet that's him!" cries Everest.
The sheriff draws his gun. 'A gunslinger robbed the freight office and killed two of my best deputies, mister. Don't give me no touble.'
" 'Hold on!' shouts the stranger. 'I was helpin' your deputies chase the real theif!'
" ' The bullet in your back says you was doin' the runnin', not the chasin'," points out Everest.
"Seeing' as there was not witnesses," concluded the guide, "the sheriff naturally had to string up the stranger."
"Naturally," sighed Haledjian. "Whoever heard of a western sheriff hanging the guilty man!"
What was the basis for Haledjian's remark?

3 weeks ago
Its not the doctor.

3 weeks ago
Or the sherriff
or because you can't hang a deadman

3 weeks ago
"The doc removes a .44 slug from the stranger's upper back, loans him a clean shirt, and fixes his right arm in a sling."

"The bullet in your back says you was doin' the runnin', not the chasin'," points out Everest.

The shooter was the Doctor:

The alley being a dead end, the person would have had to know the alley to be able to ambush the deputies. If ambushed, the robber could have killed all three, but he only wounded the stranger. He knew the shot to the back would make him look like the suspect and he could get away with the crime. Who to better know that alley then the person that live in the house in front?