Involuntary manslaughter in Georgia is not a lesser included. This is why they're charging him with felony murder - there's no other homicide offense that even conceivably fits the circumstances of this case.
I'm finding that it can be. And it is also a lesser included of malice murder if there is any evidence that the death could have been an accident:
"Sigman claims that his trial counsel was ineffective in failing to request
jury charges on lesser included offenses of simple battery and reckless conduct
for the cruelty to children, aggravated battery and aggravated assault counts of
the indictment. Sigman argues that in the absence of such lesser included
offense charges for those crimes, upon which the felony murder counts were
predicated, the jury was precluded from considering involuntary manslaughter
as a lesser included offense of the felony murder counts.
Although Sigman’s attorney did not request lesser included offense
charges for the separate counts of cruelty to children, aggravated battery and
aggravated assault, he did request that the jury be charged on involuntary
manslaughter, predicated on reckless conduct or simple battery, as a lesser
included offense of the malice murder and felony murder counts. The trial court
gave the requested charges, instructing the jurors that if they had a reasonable
doubt as to Sigman’s guilt of any of the murder counts, they could consider
whether he committed the lesser offense of involuntary manslaughter in either
of two ways. The trial court explained to the jury:
One [way] is a person commits involuntary manslaughter when that
person causes the death of . . .another human being without any
intention to do so by the commission of the offense of reckless
conduct. In that connection, I charge you the offense of reckless
conduct is defined as follows: A person who causes bodily harm to
or endangers the bodily safety of another person by consciously
disregarding a substantial and unjustifiable risk that his act will
cause harm or endanger the safety of the other person, and the
disregard constitutes a gross deviation from the standard of care
which a reasonable person would exercise in the situation. The
other [way] is a person commits involuntary manslaughter when
that person causes the death of another human being without any
intention to do so by the commission of the offense of simple
battery. In that connection, I charge you the offense of simple
battery is defined as follows: The person commits the offense of
simple battery when he intentionally causes physical harm to
another.
In addition to the jury instructions, the verdict form, as to all the murder
counts, included options for finding Sigman guilty of murder, guilty of the
lesser included offense of involuntary manslaughter, or not guilty. Thus, given
the charge and the verdict form, it is clear that, contrary to Sigman’s argument,
trial counsel ensured that
the jury was allowed to consider involuntary
manslaughter as a lesser included offense of the felony murder counts." BBM. May 17, 2010, S10A0776. SIGMAN v. THE STATE.
https://www.google.com/url?sa=t&rct...gHLo_XX2nST6uIsJQ&sig2=tZWxw3GxzT6KxiiTmoG09Q
"Joshua Banks was indicted on charges of felony murder, possession of a
firearm by a convicted felon, and possession of a firearm during the commission of
a felony.
A jury found him guilty of involuntary manslaughter1 as a lesser-included
offense of felony murder,2 and guilty of the firearm possession charges.3 Banks
appeals from the convictions and the denial of his motion for new trial, contending
that the court erred by failing to include on the verdict form reckless conduct as a
lesser-included offense of felony murder. We affirm." September 26, 2014, A14A1084. BANKS v. THE STATE
https://www.google.com/url?sa=t&rct...duiW8QxkMKlCMLBWQ&sig2=BH1_c7S03jHKrLi03U5iMA
“[A] written request to charge a lesser included offense must always be
given if there is any evidence that the defendant is guilty of the lesser included
offense.” State v. Alvarado, 260 Ga. 563, 564 (397 SE2d 550) (1990). Despite
counsel’s proper request, the trial court refused to give a charge on involuntary
manslaughter as a lesser included offense of malice murder, and instead charged
the jury that involuntary manslaughter was only a lesser included offense of
felony murder. However, as explained more fully below,
the very same evidence
that supported a charge of involuntary manslaughter as a lesser included offense
of felony murder supports the conclusion that Norris could have been guilty of
involuntary manslaughter as a lesser included offense of malice murder." BBM. Decided: March 7, 2016, S15A1692. SEABOLT v. NORRIS
https://www.google.com/url?sa=t&rct...B6OFLKItFBLlO0NWA&sig2=1yEIF2VT2jGKhPu8OIKlmA