Accessory before and during the fact to assault, assault with a deadly weapon, and murder.
The felony-murder rule says that if you are participating in the commission of a felony, and ANYBODY dies, it's murder.
That means if you're robbing a liquor store, and a responding cop shoots the owner dead, that's murder on YOU.
I've seen cases where a person was charged with murder because he was committing a felony and a responding cop had a traffic crash six blocks away on the way to the scene, killing someone.
Whether or not the accused was part of the plot is a matter of evidence. I did consider it a bit more than coincidental that he was following the decedent, recording with a mobile phone.
I'd call that a prima facie (though not yet proven) case of accessory.