In this context, he means additional factors on top of premeditated murder that would potentially qualify this to be a death penalty case, or potentially warrant the prosecution seeking the death penalty.
In Florida, a jury must unanimously agree that at least one qualifying
"aggravating factor" exists in order to impose the death penalty. Here are the aggravating factors:
(d) is obviously the big one here, but depending on facts we don't know, possible (h) or (i) could come in to play.
(l) does not apply because MS was not less than 12 years of age, but there has been discussion if SS could be sentenced to death for sexual battery of
a minor under the age of 12, in his other case. I tend to think no, because the law did not exist at the time the crime was committed (ie. the law did not exist until Maddie was 12), but as far as I know, no one "official" has weighed in to comment.