The people that Lionel Luthor killed unlawfully, in defense of others, or tried to kill.
Doubtfully accused of unlawful killing
Technically, the only unlawful killings that Lionel was explicitly confirmed as having committed are Lachlan and Eliza Luthor. The rest he was suspected of killing, but never proved. The following are people Lionel was accused of killing where there's actually some reason to doubt the truth of the accusation.
Andrea Rojas' mother
In defense of others