Also, need to define what constitutes ‘killed by.’ Depending on that definition, were quite a aways of- if were requiring agency, and a sex robot making a decision resulting in someones death.

In the middle range, someones death being the direct result of an electric sex toy, had probably already happened: its fairly likely some elderly or otherwise infirm person has had a lethal stroke /heart attack/ whatever induced by mechanically assisted sexual device.

If your definition is loose enough, autoerotic aspyxiation while using an electric toy could count. If so, were probably into quad digits by now.