It is reasonably foreseeable that someone will get knocked to the ground during the commission of an attempted robbery. However, the defense might argue that the hospital's negligence was an intervening cause in Ell's death, and that getting knocked to the ground is not normally a cause of death. And even though the hospital gave her slightly too much anaesthesia during the surgery, slight negligence on the part of a hospital is foreseeable. However, K should still be charged with felony murder in Ell's death. K may argue that it was not intention that Ell die, but this doesn't matter.
Intent is imputed from the intent to commit the felony.
K may, however, use the defense of voluntary intoxication as stated before to negate the mens rea of the attempted robbery. K could also be charged with two more counts of felony murder for the deaths of the married couple, because their deaths occurred in the attempted escape after the commission of the felony. But under the proximate cause theory, K is still liable. The cops began chasing K to SS within two minutes of their leaving the Party Store. Time and proximity are very important in determining whether the deaths occurred during the commission of the crime.