Against the charges of second degree murder, unless the jury has the option of lesser charges, e.g., manslaughter.
Even then it must rise above reasonable doubt, which is left up to the jury to decide.
That's the way it was framed by the judge in my experience with a criminal jury trial. We acquitted because the prosecution witnesses had divergent and conflicting testimony (BTW, all police officers). The first vote was 10-2 to acquit. It went to 11-1, with only the foreman voting to convict -- he was a bit of a jerk IMHO. Finally, he relented and joined the rest, but with great reluctance.
One never knows what will happen in the jury room.