You can kill a sim on The Sims 3 in many ways :
electrocution , old age, starvation, burning, drowning , etc ... and if you want to do it by another sim u have to download a mod specialized for that but u may have to reinstall ur game, als u can use a cheat so u can age the same until they expire ( shift + ctrl + testingcheatsenabled true, then right-click + shift + ctrl, so u can get a box saying trigger age transition )
To make a sim die, you have to play that sim and just wait until their hunger meter runs out and then they will die. There might be other ways, but I don't know them. This is the easiest way to do it though.
Yes for the iPhone all you have to do is make your sim die then make your coffin have a poo then eat the poo and will inspire your sim to make as much sims as you like!
you can but the don't die
not in the basegame, but if you have late night you have to make the sim a vampire, and make him/her die of thirst (which is hunger for normal sims)
You can buy a birthday cake for that Sim and once he eats it he will grow up or die if that Sim is an elder. Otherwise, you can simply wait patiently for the time to come for that Sim to grow older.
Yes the sims die. Like in all EA sims games your sim dies.
what you can do is get some one to die on the residence that your sim is on (you can have some one live there before hand and make them die, then move in your sim) and make sure that there is a tombstone,not an urn. then at night the person who died would come and haunt your sim. Or in Sims 2 Nightlife, you can make a Sim a vampire and have that Sim in a coffin and when they are asleep in that coffin, another Sim can dare another Sim to death or peak at the vampire
Your sim can die by catching on fire if near one.
Your sim cannot die on sims free play, if you want to get rid of your sim you must have more than one sim then switch to the sim you don't want, press the closet, once you in the closet, in the top left corner there will be a X press it and your sim will be deleted
no they will die of heartbroken.
I don't think you can actually delete a sim but you can kill it. If you let it's health gauge go to red then eventually it will die of malnutrition. Same with kids and teenagers as well as OAP's
If you type in "testingCheatsEnabled true" into the cheat window, you can then hold down shift and click on a Sim. It will give you the option of triggering the sim to age. you can keep doing that until they die.