Calling all Spine/Orthopedic Surgeons (and anyone else who might have some insight)

I’m doing some in depth research for a school assignment for the black dahlia case. I would like to know if you think the person who killed her and then preformed the hemicorporectomy is a doctor/surgeon/medical professional. We don’t have much information about her autopsy so we don’t exactly know how “well” it was performed. But the lower half of her body had somehow been removed by transecting the lumbar spine between the second and third lumbar vertebrae. The intestine at the duodenum was severed. Autopsy noted it was done after death because of a lack of bruising. There was another ‘gaping laceration’ (4 and 1/2 inches if that’ll help?) that ran longitudinally from the umbilicus to the suprapubic region. And that’s about all the information about the hemicorporectomy part as I have found. I just feel like I can’t properly conceptualize whether or not a medical professional had to be the one to do this or not. Keep in mind that this murder happened in 1947. To my knowledge the hemicorporectomy wasn’t even officially proposed until 1950 by Frederick E. Kredel. I would appreciate any thoughts or guesses!