a lot of these recommendations are vigilante shit. highly illegal, but you've stepped in a pile of shit that may or may not escalate to serious risk to life and health of you and your family.
I'm with @1diesel1 on this. I suspect OP is in a similar area. Despite the laws about guns and "drugs," bearing arms is a self-defense measure. Shoot accurate, not to harm but to kill. He's come bearing arms, don't take a knife to a gunfight. Put him down, call the police and shut your fucking mouth. You leave him breathing, you're liable for every single thing his lawyer will conceive you've done wrong to him.
that being said, you're still a target. no plants? he's gonna try to come inside. when he does, he might not be alone -- home invasions happen and they're way worse than getting robbed. your family is at risk now too. defend yourself accordingly.
if you don't have one on retainer yet, get a lawyer on retainer. you need that phone # ready when shit hits the fan.