Opinion by
This is a direct appeal from the imposition of a life sentence following a jury determination that appellants, all of whom were represented by court-appointed counsel, Avere guilty of murder in the first degree.
On the morning of December 20, 1967, around 10:45 a.m., Hattie Littlestone, seventy-one years of age, was set upon and robbed of her purse by three youths. In the ensuing struggle to prevent the purse-snatching, she fell to the ground and the youths fled. Miss Little-stone was pronounced dead on arrival at the hospital. While a variety of contentions are raised, because of our disposition of this appeal we can confine our discussion to one point: whether sufficient evidence was introduced to prove beyond a reasonable doubt that Hattie Littlestone’s death was caused by a criminal agency.
*185
In
Com. v. Radford,
Upon cross-examination by the defense attorneys as well as questioning by the trial judge, Dr. Wecht expressly admitted that while he was positively certain that death occurred due to the infarction, he was not convinced beyond a reasonable doubt that the struggle produced the stress which, in turn, could have caused the myocardial infarction. Instead, he was only able to reconstruct the chain of causation with a “reasonable degree of medical certainty.” That the witness was not confused by this language is evidenced by his later testimony that in a proper case he could find causation beyond a reasonable doubt.
In Radford, the Commonwealth’s witness was similarly unable to resolve the issue of causation beyond a reasonable doubt. To semantically distinguish Rad-ford’s “probable” from this appeal’s “reasonable degree *186 of medical certainty” would be irrelevant since causation must be proven beyond a reasonable doubt. Although it is hornbook law that a jury is never bound by an expert witness, when only one witness is presented by the Commonwealth to establish causation and that witness cannot do so beyond a reasonable doubt, a necessary element of the proof of that crime is miss-Mg.
Judgment of sentence reversed.
Notes
Dr. Wecht testified that the autopsy also revealed the victim had “evidence of long-standing disease of the coronary arteries” and “evidence of old scarring in the heart from previous heart attacks, previous myocardial infarctions.”
