Does Killing a Spider Attract More Spiders?
No, dead spiders won’t attract other spiders. At least not directly, but it might indirectly as their carcass can turn into food for other insects and attract other spiders to eat said insects.
The idea of a dead insect attracting others is due to a particular type of bug releasing pheromones when they are killed, alerting nearby allies to the presence of a threat and encouraging them to rally to the position to deal with the threat. This is a common bee trait and similar species to them, though not even every species of it can release said pheromone.
Spiders are arachnids that live mostly a solo life, not being part of a bigger social circle like ants or bees. So the idea of a dead spider attracting more spiders doesn’t really make much sense, as there aren’t any that would happily jump in to help out. They are opportunistic, though, and if one of their buddies dies in a spot, they’ll move in and use the food source the late spider was feeding on.